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was able to accomplish this with the following

const topicSubscription = new gcp.pubsub.Subscription('sub', {
  pushConfig: {
    oidcToken: {
      serviceAccountEmail:
        <mailto:'x@appspot.gserviceaccount.com|'x@appspot.gserviceaccount.com>',
    },
    pushEndpoint: apiServiceUrl,
  },
  topic: topic.id,
});