NXT Segment - Create a "User" segment for internal comms in JO

We use JO and want to start utilizing more heavily for internal comms. We would love to leverage “Segments” like we do for our customer contacts. Think a segment for our “CSM” team, “all company” which we sent our external newsletter to, etc. 

currently, you can only create segments on Company, Company Person, Relationship, or Relationship Person. It would be great to expand this to “User” as well.