curl --request POST \
  --url https://reelmirror.com/api/v1/publishing/caption \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "generated_media_item_ids": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ],
  "persona_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

{
  "data": {
    "caption": "<string>"
  }
}