Like in MB, we should have a publisher-publisher relationship to connect imprints and companies. See MB's relationship: https://musicbrainz.org/relationship/23f8c592-006d-4214-9080-c4e5000c05d7

We currently have an “owns” relationship we can use for this, but “owns” makes more sense to use with companies, e.g. X company ows subsidiary Y. It would be better to have something more specific for imprints.