Just chiming in to say I'm also looking for a solution that lets us use DAB variables in parameters. This would really let us improve reuse and configuration across multiple environments and clients. Then we can set the various options via a deployment pipeline to improve reusability.

My only other thought is to serialize the dashboard json and treat it as a string "serialized_dashboard" (https://docs.databricks.com/aws/en/dev-tools/bundles/resources#dashboard), but that seems really ugly.