Please comment/vote in the existing suggestion which is already asking for that option.
This should help preventing duplicate threads which distract/disperse votes.
https://forums.plex.tv/t/a-setting-to-allow-music-artwork-from-track-rather-than-album/427719
Edit: There’s an even more popular one asking for an option to use embedded artwork per track. I suppose those two are having quite some overlap too…
