Make "categories" for friends

I just thought about a new feature Discord could implement : As you probably know, since the start of the pandemic, Discord has become a new platform for school and other professional things. And with that new use, some of our "friends" are actually professors, or any other kind of people. So I think it could be very useful to anyone to be able to "categorize" our friends. Or maybe create groups of friends (like we can already do with servers). Thanks in advance for your answer, have a good evening. :D