lastgenre: Ignore featuring artist during genre lookup

Coming from Picard to do my tagging one of the nice features the Picard Last FM genre plugin has is the ability to ignore featured artists when looking up tags for the track genre.
https://github.com/fdemmer/Picard-Last.fm.ng-Plugin

Would that be possible to implement in the lastgenre plugin?
This is the commit in which they implemented it:
https://github.com/fdemmer/Picard-Last.fm.ng-Plugin/commit/ddf77714312d57cd1b0fe45310355b2d80414daa

Start by reading the beets lastgenre plugin and the linked Picard Last.fm plugin commit to understand how featured artists are identified and excluded. Implement equivalent behavior for genre lookup, then verify that tracks with featured artists use the primary artist; the issue does not name a test file.

Written by the indexing model from the issue text.