pubsub_overrides.json

{
    "trigger_overrides": [{
        "triggerNumber": "1",
        "triggerType": "CLOUD_PUBSUB_EXTERNAL",
        "projectId": "my-project",
        "topicName": "topic"
    }],
    "task_overrides": [{
        "taskId": "1",
        "task": "GenericRestV2Task",
        "parameters":  {
            "url": {
                "key": "url",
                "value": {
                    "stringValue": "https://httpbin.org/ip"
                }
            }
        }
    }]
}