For many albums (especially Classical) the album artist can consist of more than one person. If they are stored in a single Album Artist field and then imported into Roon you can hit the issue that the album artist is just represented as a single artist.
So if you click on the link its not going to provide what you want.
But as long as you add Album Artist to the Save multiple values as separate fields option in SongKong then Roon will keep the album artists separate.
Note, now when the view the album each of the three album artists are separated by a forward slash
and you can select them individually. Note they are not stored with ‘/’ in the files, they are stored as separate values, and exactly how this is done is format specific. The forward slashes are added by Roon in the user interface for clarity.