You need 4 pair and you also need to know where the other end of the connection is. If it goes straight outside to a telephone demark, it doesn’t do you a lot of good. If it goes to a patch panel somewhere else in the house then it can probably be repurposed.
You’ll get a much better result if you use a wired backhaul and then you don’t need any of those mesh systems. You could then use standard AP’s.