Make activeService optional for a blueGreen rollout

[ibuiltthis]

I am using Istio and routing traffic based on labels . This is useful as I can ensure that all pods in preview communicate together and all pods in active communicate together. I am able to set the labels on the pods during the rollout using the ativeMetadata and previewMetadata config below.

However I am still required to nominate a service for the activeService even though I don't want argo rollouts to modify the service in any way. I have created a workaround by creating a second service that isn't used but this messy and confusing. Is there a reason that argo rollout must modify an activeService during a rollout?

  strategy:
    blueGreen:
      autoPromotionEnabled: false
      activeMetadata:
        labels:
          role: active
      previewMetadata:
        labels:
          role: preview
      # This is only here because an activeService is required so we make a unused service. 
      #   Routing is achieved through setting role label to active / preview on each pod and using config in Virtual Service and Destination 
      activeService: argorollouts-workaround-helloworld