Local domain reverse lookups?

I've got the ctrld service running on an OPNsense router. ctrld listens for all dns requests on port 53 and if it gets any for my local domain it passes them to unbound running on the same router on a different port. That works fine for forward lookups. For example, I can do nslookup theprinter.home and get 192.168.100.15.

I really want to get reverse lookups to work as well but I'm not sure how to do that. Any pointers (!) would be much appreciated.