No, I added this as feature request in ixSystems bug tracker.
When you are using a docker VM ( Rancher OS ) you cannot use some network services if you change the port number ( DNS port 53 UDP and TCP ). So a solution could be make two NICs in VM, and assign different IP addresses to them ( like 192.168.1.11 and 192.168.1.12 ) so you can setup both of them with different containers and you can execute two DNS servers at the same time.