There is some implementation towards that by supporting SHA256, but likely not the RFC8760 implementation. See:
* https://www.kamailio.org/docs/modules/stable/modules/auth.html#auth.p.algori...
I think I heard @oej wanted to work a bit on this area, not sure if he got the time for it. Obviously, anyone is welcome to jump on board and implement it.
If no developer/contributor takes over to implement it in like 30 days, it means that there is no interest/need/availability to do it at this moment, request for features being closed without a developer that want to works on them.