Take it off the wall and see how it’s wired. If I remember correctly, you only need a few wires to make these things work. Some people ran 16/4, some people ran CAT. Depending on how they’re wired you can do a lot with that space.
Looks like it takes a 6 conductor…so it should be CAT. If it’s CAT3 it’ll be useless for data, but it can be used for triggers (just like the current intercom), if it’s CAT5 or CAT5e+ you can use it for data.