Importing record label info to plex

I’ve been spending some time importing the some jrock compilations into musicbrainz. After updating my beets library to see the new MB records and rescanning in plex, I noticed that the Record Label entry is blank in plex. This is a bit annoying as I wanted to create a Smart Collection based on title and label.

Should I expect label to be imported in plex? Is it important that the files in question are flac?