That would require a content provider that has a large and well-constructed database of such images. (back covers, booklet pages, inserts, etc. etc.)
All indexed properly and consistently. Probably also needing to be differentiated between release countries, languages, and release versions. ('deluxe', extended, etc.)
And that provider would also need to have a (free to use) API available so that software such as MusicBee can use it.
Are you aware of any provider that fits that bill?
(yeah, sorry, that's a rhetorical question that I think I already know the answer to)