{
  "merge": {
    "resources": {
      "Instance": {
        "operation": "DescribeInstances",
        "resourceIdentifier": {
          "InstanceIds": "Reservations[].Instances[].InstanceId"
        }
      }
    },
    "operations": {
      "DescribeInstances": {
        "InstanceIds": {
          "completions": [
            {
              "parameters": {},
              "resourceName": "Instance",
              "resourceIdentifier": "InstanceIds"
            }
          ]
        }
      }
    }
  }
}