ArgoCD application with plugin

application.yaml

apiVersion:  argoproj.io/v1alpha1
kind:  Application
metadata:  
  name:  testapp 
  namespace:  argocd
spec:  
  project:  default
  source:  
    repoURL: git@gitlab.com:my/repo/charts.git   
    targetRevision:  master
    path:  charts/testapp
    plugin:
      name: helmSecrets
      env:
        - name: HELM_OPTS
          value: "-f secrets.yaml"
        - name: RELEASE_NAME
          value: "testapp"
  destination:  
    server:  https://kubernetes.default.svc
    namespace:  testapp
  syncPolicy:
    automated: {}
    syncOptions:
      - CreateNamespace=true