How to reuse values with helm step

[jindalrj]

We have multiple repositories and a single helm chart. Pipeline for each repository only knows the image-version of its own docker image but not others. With regular helm binary we can use '--reuse-values' and only supply the changed image as part of deployment.

Official helm step by codefresh explicitly resets values and thus requires all values. See below code snippet in official plugin

    def build_export_commands(self, google_application_credentials_json):
        lines = super().build_export_commands(google_application_credentials_json)
        return lines

    def build_helm_upgrade_command(self, release_name, chart_ref):
        return 'helm upgrade %s %s --install --reset-values ' % (release_name, chart_ref)

    def build_repo_commands(self):
        lines = []
        lines.append('helm repo add cf-stable https://kubernetes-charts.storage.googleapis.com/')
        return lines

How can we override this behavior? Do codefresh provide steps/feature to maintain a central values file?