What would you like to be added?

During helm install allow a --values-from-configmap= which is then read from the destination cluster/namespace and sets values. I'd expect non-cluster values.yaml files to override if a mix are specified.

ie helm install oci://my/chart:latest --namespace example --values-from-configmap=example-configmap --values myfile.yaml

Why is this needed?

This would help ensure helm install or helm update operations are less tied to a specific user have specific files checked out. Physically local values overrides could be moved into a cluster's namespace to avoid any machine local dependencies.