Album Description

On mp3tag, is there a tag for adding an album description. On iTunes / Apple Music this is seen as "Editors Notes" or "iTunes Review". I've attached an image below of an album description on apple music.

the usual way would be to make sure that the data is saved to file and then check the file in MP3tag's extended tags dialogue (Alt-T).
If you find the text in a field, fine. Remember the fieldname and re-use it for other files.

I see a problem though: if this is information that Apple saves with the album, then it looks like this is stored only in the Apple data base. MP3tag does not know anything about albums, so that field would have to be available in every file that should belong to an album. But let's see if you find anything.