Hi Nils,
Good afternoon and thank you for your question. I highly suggest providing feedback on the documentation and advised what information you will need to be updated. You can do this by going under the documentation, select This page under Submit and view feedback for. Request for the additional details on using zoom and the available parameters and values under driveItem: preview endpoint.
I hope I was able to help you or redirect you in the right direction and may you have a great day ahead.