Google Deployment manager create a resource if not exist?

Is there a way to create a resource if it doesn't exist and use an existing resource if it does?

resources:
  - name: "my-topic"
    type: gcp-types/pubsub-v1:projects.topics
    properties:
      topic: "this-exists-already"
  - name: "my-other-resource"
    type: 'gcp-types/cloudfunctions-v1:projects.locations.functions'
    properties:
      functionName: "function"
      environmentVariables:
        # get a ref to new or already existing topic
        my-toptic: "$(ref.my-topic.name)"

Per @kolban's link I think I want to use abandon here. Can I selectively "abandon" a specific resource so I can, for example, attach an accessControl policy to an existing bucket but then NOT delete that bucket if the deployment is deleted?

ABANDON - This removes any references to the resource from the deployment but does not delete the underlying resource. For example, abandoning an instance means that it is removed from a deployment but the instance still exists for you to use.

Edit

Maybe I should use an "action" to assign an acl instead of a resource? Is this the right way and are there examples of this? So DM would essentially just execute an api call to apply an acl out-of-band. That would mean it would leave the acl behind if the deployment is deleted but I'm okay with that.

It looks like I want to do something like this but instead of applying an acl to a specific file I want to set it on the bucket (with an action) https://github.com/GoogleCloudPlatform/deploymentmanager-samples/blob/master/community/storage-bucket-acl/storagebucket-acl.jinja#L29.