diff --git a/src/bundle/DependencyInjection/IbexaFieldTypeRichTextExtension.php b/src/bundle/DependencyInjection/IbexaFieldTypeRichTextExtension.php
index 0243c827..18cfcfa8 100644
--- a/src/bundle/DependencyInjection/IbexaFieldTypeRichTextExtension.php
+++ b/src/bundle/DependencyInjection/IbexaFieldTypeRichTextExtension.php
@@ -8,6 +8,7 @@
 
 namespace Ibexa\Bundle\FieldTypeRichText\DependencyInjection;
 
+use Ibexa\Contracts\Core\Container\Encore\ConfigurationDumper as IbexaEncoreConfigurationDumper;
 use Ibexa\Contracts\FieldTypeRichText\Configuration\Provider;
 use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
 use Symfony\Component\Config\FileLocator;
@@ -32,6 +33,12 @@ class IbexaFieldTypeRichTextExtension extends Extension implements PrependExtens
 
     private const RICHTEXT_TEXT_TOOLBAR_NAME = 'text';
 
+    private const WEBPACK_CONFIG_NAMES = [
+        'ibexa.richtext.config.manager.js' => [
+            'ibexa.richtext.config.manager.js' => [],
+        ],
+    ];
+
     public function getAlias()
     {
         return self::EXTENSION_NAME;
@@ -77,6 +84,10 @@ public function load(array $configs, ContainerBuilder $container)
         $configuration = $this->getConfiguration($configs, $container);
         $config = $this->processConfiguration($configuration, $configs);
         $this->registerRichTextConfiguration($config, $container);
+
+        (new IbexaEncoreConfigurationDumper($container))->dumpCustomConfiguration(
+            self::WEBPACK_CONFIG_NAMES
+        );
     }
 
     /**
diff --git a/src/bundle/Resources/encore/ez.webpack.custom.config.js b/src/bundle/Resources/encore/ez.webpack.custom.config.js
index 12c37610..adc15741 100644
--- a/src/bundle/Resources/encore/ez.webpack.custom.config.js
+++ b/src/bundle/Resources/encore/ez.webpack.custom.config.js
@@ -1,6 +1,8 @@
 const Encore = require('@symfony/webpack-encore');
 const path = require('path');
 const { styles } = require(path.resolve('./public/bundles/ibexaadminuiassets/vendors/@ckeditor/ckeditor5-dev-utils'));
+const ibexaConfigManager = require(path.resolve('./ibexa.webpack.config.manager.js'));
+const configManagers = require(path.resolve('./var/encore/ibexa.richtext.config.manager.js'));
 
 Encore.reset();
 Encore.setOutputPath('public/assets/richtext/build').setPublicPath('/assets/richtext/build').enableSassLoader().disableSingleRuntimeChunk();
@@ -53,4 +55,10 @@ customConfig.module.rules.push({
 customConfig.module.rules[1] = {};
 customConfig.module.rules[2] = {};
 
+configManagers.forEach((configManagerPath) => {
+    const configManager = require(path.resolve(configManagerPath));
+
+    configManager(customConfig, ibexaConfigManager);
+});
+
 module.exports = customConfig;