I haven't seen anything like this built-in. It has also been discussed a bit on this forum before, and I do not think anyone has found a way to do it without scripting.
There are a couple of ways you could script this sort of thing. All of the robots have a created date on the hub, so you could check those to see what is new. Otherwise you would probably have to keep a list of all robots and rescan periodically. You could do this hub by hub, but that could be problematic if robots failover to a secondary hub.