Dynamic *.home.arpa DNS with Unbound + dnsmasq in OPNsense

[kss]

Apologies if this is not very clear --

I am running the current stable version of OPNsense and use dnsmasq for DHCP and Unbound for all DNS. My current setup uses internal domains such as 1.mydomain.com, 2.mydomain.com, etc., with DNS queries forwarded over WireGuard, and this works reliably for both short-name and FQDN resolution across the sites.

What is the correct way to configure Unbound and dnsmasq so that DHCP clients automatically create and retain dynamic DNS records under *.home.arpa, including handling of hostname changes and lease renewals, without relying on static host overrides?

I'm trying to determine whether an equivalent configuration is supported or achievable for *.home.arpa, and if so, how I should go about it. Thanks.