Some commercial companies (e.g. Orbit Fab) are selling refuelling ports for satellites, FWIW. NASA put a lot of research into it as well, IIRC. For the JWT it

Some commercial companies (e.g. Orbit Fab) are selling refuelling ports for satellites, FWIW. NASA put a lot of research into it as well, IIRC. For the JWT it's probably quite different, but for commercial earth observation sats, there are lots of folks considering including some of the refuelling port designs in current hardware even though the actually "refuel in space" service isn't available yet.