Support setting the cover image of an object

Have you read a contributing guide?

• I have read CONTRIBUTING.md
• I have searched the existing requests and didn't find any that were similar
• I have considered creating a pull request instead and want to proceed

Clear and concise description of the problem

Currently I don't see a field where one can set the cover image of an object.

Properties in the API do support files looking through the doc:

The format of the property used for filtering

Possible values: [text, number, select, multi_select, date, files, checkbox, url, email, phone, objects]

But I'm unsure which key to target?

Suggested solution

A small example showing which key to use to set the cover of an object, or API support if it isn't already there.

Alternative

No response

Additional context

Would like to make a tracker for books read, to read etc and setting the cover would be very much appreciated!

Start with the API documentation and its property format, especially the listed files value. Determine whether an existing property key can set an object's cover image or whether API support is missing. Done means providing a working example with the correct key, or documenting the required API change and its expected behavior.