Send JS payload in JSON Responce

what is the best way to pass along some JS in my responses. Can I get something like the following code as a response?

`
  "status": 200,
  "messages": [
    {
      "type": "text",
      "text": "heard you 2",
      "script": "alert('Hello World');",
      "attachment": null,
      "additionalParameters": []
    }
  ]
}
`