Yes, check out my most recent comment in the linked topic.
We're working on this. It is not all that straightforward as it may seem, especially since MAC addresses are only visible in the immediate vicinity of your Pi-hole (it will not work across routers, VLANs, etc.). You can monitor https://github.com/pi-hole/FTL/pull/762 for our progress. Currently, it is still a feature draft, albeit a working one. If you (or anyone else) want to test it at any point, it would be appreciated.