Welcome to the Disability Travel forum, rjh090384.

You should have no problem with this. When you get to the gate, say that you want to gate-check your rollator, and that you want it back during your connection. You will be given a gate-check tag (like the tags put on strollers/prams) for it.

It's a good idea to remind a flight attendant shortly before landing that you expect your rollator to be delivered to the door of the plane on the jetway, both at your connection and at your final destination.

If you encounter any problems, do not leave the plane. The crew cannot leave the plane until all the passengers have left, so they are motivated to help get your equipment back to you if you're still on the plane.