The artist roles that Spotify currently publishes are just two: "Primary Artist" and "Featuring Artist".
So, from now on, if you assign an artist with the role of "Performer" in Spotify will be published as "Primary Artist". And if you assign an artist as "With" or "Featuring", in Spotify it will be published as "Featuring Artist" indistinctly.
All other assigned roles than those listed above will not appear in the album information published in Spotify.