2020-06-19, 22:58
OP seems to have no further questions here, so just to round it up:
https://picard.musicbrainz.org/docs/tags/
https://picard.musicbrainz.org/docs/mappings/
https://picard.musicbrainz.org/docs/tags/
https://picard.musicbrainz.org/docs/mappings/