How to let helm version read environment variables when using skaffold deploy

[foursunZero]

apiVersion: skaffold/v2beta28
kind: Config
metadata:
  name: vmstack
deploy:
  helm:
    flags:
      upgrade:
        - --timeout
        - 600s
        - --debug
      install:
        - --debug
    releases:
      - name: vm-operator
        repo: https://victoriametrics.github.io/helm-charts/
        remoteChart: victoria-metrics-operator
        version: {{ .CHART_VERSION }}

I tried to configure as above and deploy as follows, but an error was reported during the deployment process

$ skaffold deploy 
parsing skaffold config: error parsing skaffold configuration file: unable to re-marshal YAML without dotted keys: unable to parse YAML: yaml: invalid map key: map[string]interface {}{".CHART_VERSION":interface {}(nil)}

How to dynamically select the version to be deployed?

[acj]

I ran into this error when trying to use setValueTemplates. In case it helps, the solution was to quote the template string:

version: "{{ .CHART_VERSION }}"