Adding request body when calling getImageFile

## 💬 Questions and Help

I have searched through the documentation and existing issues but have not found anything with regards to adding a body in the request. Is there a way I can add JSON objects into the request body when using getImageFile?

Start at the getImageFile entry point and trace how its request is built. Review the package documentation and existing request-related behavior to determine the intended way to provide a JSON body. Done means the supported behavior is clearly defined and verified for getImageFile requests.

索引モデルが issue の本文から書いたものです。