Use configMapGenerator with values.yaml files from another repo

[socalkol]

I currently have two separate GIT repositories being used by flux, one that handles the flux configuration and one that stores my helm charts

git-group/flux-config
git-group/helm-charts

I am trying to merge multiple values using the kustomize configMapGenerator for my helmrelease that resides in my flux-config repository, but these values files reside in the helm-charts repository, not the repository with the flux-config, is there a way to accomplish this task with the helmrelease/flux config not existing in the same repository as the files i am trying to merge with the configMapGenerator. It appears configMapGenerator is part of base kustomize, so i can't reference a difference source like i can for my other flux logic.

Project structure example

Helm Chart Repo

git-group/helm-charts/helm-app1/values.yaml
git-group/helm-charts/helm-app1/values-env.yaml

Flux Repo

git-group/flux-config/cluster1/flux-system/
git-group/flux-config/cluster1/helm-release.yaml (needs both values.yaml and values-env.yaml)
git-group/flux-config/cluster1/configMapGenerator.yaml