Endpoint for fetching current post validation rules depending on the platform

It would be great to have an API endpoint for fetching current validation rules, depending on a platform provided as a query argument in the URL. For example, validation rules can be like that:

1. MIN and MAX length of the “content“ field.

2. Whitelist of file formats for images and videos.

3. MIN and MAX size (in bytes) for image and video files.

Best regards,
Vladyslav