You can add a relation between a release group and an artist for tributes to an artist. But is there a way to handle tributes to a label like https://musicbrainz.org/release-group/1b2b0f70-4167-4d26-8ac1-722ec1b93261 is a tribute to https://musicbrainz.org/label/e0b106a5-4add-4839-9e40-c192457e1bf8
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Not to my knowledge.
You can always make a STYLE ticket over at JIRA in order to get the relationship added.
I found this release group. It’s not obvious to anyone without the background knowledge, but according to this article it’s a tribute to a label. Since there’s already a discussion but no issue I went ahead and created one.
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I added a relationship but I can’t read your article, so you can add the appropriate tribute link yourself 
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That’s quick, thanks! The relevant part translated in case you were interested:
The label MNW turns forty-four and celebrates with a tribute album, a number of today’s artists interpret something from the company’s catalog.
Unfortunately, it only received a 1 on a 0-5 scale