Newbie Q: how to write custom header

[Jeffr-K]

I wonder how to make custom header in rest-client file.

// user.rest
### POST /user

POST {{user}}
Content-Type: application/json
custom-header: { "info": "example info", "token": "token" }

{
  // ... here is body..
}

// here is vs-code setting.json
{

// ...  code

"rest-client.defaultHeaders": {
    "User-Agent": "vscode-restclient",
    "devicdeInfo": "vscode-restclient"
  }
}

how do I make custom-header with rest-client??