Conditional server *with port* specified

Hello! I'm running a local authoritative DNS server under port 9953, I've tried setting it up as a conditional in blocky, but I'm not succeeding in specifying the port. Is this supported? ``` conditional: fallbackUpstream: false mapping: example.com: tcp+udp:10.1.2.3:9953 example.org: tcp+udp:10.1.2.3:9953 ``` Thanks for a great DNS proxy!