Those Artists who have a Wikipedia article about them and have that article linked as an External Link, or a Wikidata link, have their Wikipedia article appear on their MB Artist page.
But Wikipedia has very exclusive standards for who can be the subject of a WP article.
Whereas Musicbrainz has very inclusive standards.
I’d suggest frame the bio in a way that makes it helpful to future MB Editors and then include it in the Annotation for the Artist.
You can find the “Edit annotation” link lowish on the right hand side of the MB Artist page.