It can be solved via the file tags:
Open the album in a tag editor
- Separate the work and the part with a colon in the track title (e.g. ‘El Dorado: Long-shadowed Sun’)
- Give all the parts the same composer tag (I used Marillion as composer)
Configure Roon to use the file tags
- Edit the album and let Roon use the file tags, instead of its own data
The result:
