“What I mean is, if an app itself does not include GMS but has situations where it needs to call GMS. For example, some video processing software on F-Droid requires Google services. Can they be marked?”
“I haven’t looked at its source code, but they also redirect to the same interface after clicking to add a video file. Here are the screenshots, and it is not functional.”
It looks like you are trying to add a video that is hosted in your Google Drive or Google Photos. If that is the case, you will need to grant access to the video editor using your Google credentials. Instead you can download the video to your device storage and add a video from there.