Here is what my looks like:

{
  "assistantId": "<ASSISTANT_ID>",
  "assistantOverrides": {
    "variableValues": {
      "firstName": "Aram"
    },
    "voice": {
      "provider": "vapi",
      "voiceId": "Hana"
    }
  }
}

However, none is being applied. I'm very new to this so I believe I've made many mistakes. Could you tell me how to setup the

assistant-reuquest

part? I think I have not configured it properly. Thanks.