Using tags and playlist with tags that are in the files

Hi,
how can I use information that are in tags of my music files (e.g. the RATING in FLAC files) in order to create my tags and playlists?
Thank you a lot in advance.
Best regards
Al

You can add fields in your files called ROONALBUMTAG & ROONTRACKTAG, which Roon will then pick up and auto apply as appropriate. See FAQ.

Thank you for the tip how to introduce additional tags from the files.
In my case I already can see that Roon recognized a field in the FLAC files called RATING which is already populated with values.
How can I use this field for tagging and filtering? This field is not getting displayed to me like e.g. composers or performers.
Best regards
Al