How do I do progressive delivery for Backstage with Argo CD?

    apiVersion: argoproj.io/v1alpha1
    kind: Application
    metadata:
      name: backstage-app
      namespace: argocd
    spec:
      source:
        repoURL: 'https://github.com/your-org/backstage.git'
        targetRevision: HEAD
        path: 'path/to/backstage'
      destination:
        server: 'https://kubernetes.default.svc'
        namespace: backstage
      syncPolicy:
        automated:
          selfHeal: true
          prune: true
        syncOptions:
          - CreateNamespace=true
      # Define progressive delivery rollout strategies here
      rollouts:
        - name: 'backstage-rollout'
          strategies:
            canary:
              steps:
                - setWeight: 20
                - pause: { duration: 15m }
                - setWeight: 50
                - pause: { duration: 15m }
                - setWeight: 100