diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js b/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js
new file mode 100644
index 0000000000000..63f75e83b7656
--- /dev/null
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js
@@ -0,0 +1,29 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict
+ */
+
+import typeof * as ExportsType from './ReactFeatureFlags.native-fb-dynamic';
+import typeof * as DynamicFlagsType from 'ReactNativeInternalFeatureFlags';
+
+// In xplat, these flags are controlled by GKs. Because most GKs have some
+// population running in either mode, we should run our tests that way, too,
+//
+// Use __VARIANT__ to simulate a GK. The tests will be run twice: once
+// with the __VARIANT__ set to `true`, and once set to `false`.
+//
+// TODO: __VARIANT__ isn't supported for React Native flags yet. You can set the
+// flag here but it won't be set to `true` in any of our test runs. Need to
+// update the test configuration.
+
+export const enablePersistentOffscreenHostContainer = __VARIANT__;
+
+// Flow magic to verify the exports of this file match the original version.
+// eslint-disable-next-line no-unused-vars
+type Check<_X, Y: _X, X: Y = _X> = null;
+// eslint-disable-next-line no-unused-expressions
+(null: Check<ExportsType, DynamicFlagsType>);
diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb.js b/packages/shared/forks/ReactFeatureFlags.native-fb.js
index 8d0a2256ec7d2..f6ab60d3ed642 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fb.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb.js
@@ -10,6 +10,14 @@
 import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
 import typeof * as ExportsType from './ReactFeatureFlags.native-fb';
 
+// Re-export dynamic flags from the internal module. Intentionally using *
+// because this import is compiled to a `require` call.
+import * as dynamicFlags from 'ReactNativeInternalFeatureFlags';
+
+// We destructure each value before re-exporting to avoid a dynamic look-up on
+// the exports object every time a flag is read.
+export const {enablePersistentOffscreenHostContainer} = dynamicFlags;
+
 // The rest of the flags are static for better dead code elimination.
 export const enableDebugTracing = false;
 export const enableSchedulingProfiler = false;
@@ -60,8 +68,6 @@ export const disableSchedulerTimeoutInWorkLoop = false;
 export const enableLazyContextPropagation = false;
 export const enableSyncDefaultUpdates = true;
 export const allowConcurrentByDefault = true;
-// TODO: Import this from internal ReactNativeFeatureFlags instead
-export const enablePersistentOffscreenHostContainer = __EXPERIMENTAL__;
 
 // Flow magic to verify the exports of this file match the original version.
 // eslint-disable-next-line no-unused-vars
diff --git a/scripts/flow/config/flowconfig b/scripts/flow/config/flowconfig
index ada7f2207be5c..2ace94c2d7cba 100644
--- a/scripts/flow/config/flowconfig
+++ b/scripts/flow/config/flowconfig
@@ -34,6 +34,7 @@
 ./scripts/flow/react-devtools.js
 ./scripts/flow/react-native-host-hooks.js
 ./scripts/flow/react-relay-hooks.js
+./scripts/flow/xplat.js
 
 [lints]
 untyped-type-import=error
diff --git a/scripts/flow/xplat.js b/scripts/flow/xplat.js
new file mode 100644
index 0000000000000..c013af3e125d8
--- /dev/null
+++ b/scripts/flow/xplat.js
@@ -0,0 +1,12 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+declare module 'ReactNativeInternalFeatureFlags' {
+  declare export var enablePersistentOffscreenHostContainer: boolean;
+}
diff --git a/scripts/rollup/bundles.js b/scripts/rollup/bundles.js
index fb64c0e6e07f4..54c0552ba5649 100644
--- a/scripts/rollup/bundles.js
+++ b/scripts/rollup/bundles.js
@@ -79,7 +79,7 @@ const bundles = [
     moduleType: ISOMORPHIC,
     entry: 'react',
     global: 'React',
-    externals: [],
+    externals: ['ReactNativeInternalFeatureFlags'],
   },
 
   /******* Isomorphic Shared Subset *******/
@@ -105,7 +105,7 @@ const bundles = [
     moduleType: ISOMORPHIC,
     entry: 'react/jsx-runtime',
     global: 'JSXRuntime',
-    externals: ['react'],
+    externals: ['react', 'ReactNativeInternalFeatureFlags'],
   },
 
   /******* React JSX DEV Runtime *******/
@@ -124,7 +124,7 @@ const bundles = [
     moduleType: ISOMORPHIC,
     entry: 'react/jsx-dev-runtime',
     global: 'JSXDEVRuntime',
-    externals: ['react'],
+    externals: ['react', 'ReactNativeInternalFeatureFlags'],
   },
 
   /******* React Fetch Browser (experimental, new) *******/
@@ -372,6 +372,7 @@ const bundles = [
       'react',
       'ReactFlightNativeRelayServerIntegration',
       'JSResourceReferenceImpl',
+      'ReactNativeInternalFeatureFlags',
     ],
   },
 
@@ -385,6 +386,7 @@ const bundles = [
       'react',
       'ReactFlightNativeRelayClientIntegration',
       'JSResourceReferenceImpl',
+      'ReactNativeInternalFeatureFlags',
     ],
   },
 
@@ -432,7 +434,7 @@ const bundles = [
     moduleType: RENDERER,
     entry: 'react-native-renderer',
     global: 'ReactNativeRenderer',
-    externals: ['react-native'],
+    externals: ['react-native', 'ReactNativeInternalFeatureFlags'],
     babel: opts =>
       Object.assign({}, opts, {
         plugins: opts.plugins.concat([
@@ -462,7 +464,7 @@ const bundles = [
     moduleType: RENDERER,
     entry: 'react-native-renderer/fabric',
     global: 'ReactFabric',
-    externals: ['react-native'],
+    externals: ['react-native', 'ReactNativeInternalFeatureFlags'],
     babel: opts =>
       Object.assign({}, opts, {
         plugins: opts.plugins.concat([
@@ -499,7 +501,12 @@ const bundles = [
     moduleType: RENDERER,
     entry: 'react-test-renderer',
     global: 'ReactTestRenderer',
-    externals: ['react', 'scheduler', 'scheduler/unstable_mock'],
+    externals: [
+      'react',
+      'scheduler',
+      'scheduler/unstable_mock',
+      'ReactNativeInternalFeatureFlags',
+    ],
     babel: opts =>
       Object.assign({}, opts, {
         plugins: opts.plugins.concat([
@@ -692,7 +699,7 @@ const bundles = [
     moduleType: ISOMORPHIC,
     entry: 'scheduler',
     global: 'Scheduler',
-    externals: [],
+    externals: ['ReactNativeInternalFeatureFlags'],
   },
 
   /******* React Scheduler Mock (experimental) *******/
@@ -710,7 +717,7 @@ const bundles = [
     moduleType: ISOMORPHIC,
     entry: 'scheduler/unstable_mock',
     global: 'SchedulerMock',
-    externals: [],
+    externals: ['ReactNativeInternalFeatureFlags'],
   },
 
   /******* React Scheduler Post Task (experimental) *******/
diff --git a/scripts/rollup/modules.js b/scripts/rollup/modules.js
index b56f4231e2ef0..2461e28850cc0 100644
--- a/scripts/rollup/modules.js
+++ b/scripts/rollup/modules.js
@@ -21,6 +21,7 @@ const importSideEffects = Object.freeze({
   'react-fetch/node': HAS_NO_SIDE_EFFECTS_ON_IMPORT,
   'react-dom': HAS_NO_SIDE_EFFECTS_ON_IMPORT,
   url: HAS_NO_SIDE_EFFECTS_ON_IMPORT,
+  ReactNativeInternalFeatureFlags: HAS_NO_SIDE_EFFECTS_ON_IMPORT,
 });
 
 // Bundles exporting globals that other modules rely on.
@@ -31,6 +32,7 @@ const knownGlobals = Object.freeze({
   'react-interactions/events/tap': 'ReactEventsTap',
   scheduler: 'Scheduler',
   'scheduler/unstable_mock': 'SchedulerMock',
+  ReactNativeInternalFeatureFlags: 'ReactNativeInternalFeatureFlags',
 });
 
 // Given ['react'] in bundle externals, returns { 'react': 'React' }.