curl --request POST \
  --url https://api.example.com/frames/{frame_id}/text

{
  "frame_id": 123,
  "text_positions": [
    {
      "text": "<string>",
      "confidence": 123,
      "bounds": {
        "left": 123,
        "top": 123,
        "width": 123,
        "height": 123
      }
    }
  ]
}