Developed and used in all environments in BaseCRM. We store secrets and values in helm_vars dir structure just like in this repository example dir. All this data versioned in GIT. Working in teams on multiple projects/regions/envs and multiple secrets files at once. We have Makefile in our Helm charts repo to simplify install helm-secrets plugin with helm and other stuff we use. Same Makefile used to rebuild all helm charts with dependencies and some other everyday helpers. Encrypting, Decrypting, Editing secrets on local clones, making #PR's and storing this in our helm charts repo encrypted with PGP, AWS KMS and GCP KMS. Deploying using helm-wrapper from local or from CI with same charts and secrets/values from GIT repository.