OPNsense 21.7.2 registration of dhcp6 client in DNS server

[kpwn]

Hi Everyone
the GUI allows the setup of dhcp6 client registration with nameserver that are diffeerent from the FW which is great. Sadly you have to enter a IPv6 adress that points to the primary DNS server of the domain.
Some DNS servers are only reachable through IPv4, even tho they resolve IPv6 adresses.
I suggest changing that so users are able to enter IPv4 Adresses for the nameservers as well. And while beeing at it, why even enforce the entering of an IP address? I would like to enter the FQDN of the nameserver, which is a better solution in my opinion.

Is there a known workaround?