Pihole can do this out of the box by going to the dns settings and adding a host. Alternatively, if your pihole is also your dhcp provider, you can set the hostname on each and pi hole should resolve it.

https://thiagowfx.github.io/2022/01/pihole-add-custom-dns-mappings/

You would need an extension that could implement the drm, which would be no small feat and I’m not even sure how poss that would be with the extensions API. Not saying it won’t happen but i wouldn’t hold my breath.