Apologize for the very late chime here…
CentOS Stream is an upstream distribution; as such, BigFix is not currently planning to provide support for it.
There’s a few other free Redhat-based downstream distributions, either already available or soon to come.
One of these is Rocky Linux, as mentioned by Casey,
It seems the community has not yet manifested a strong preference.
I suggest ideas on A.Ha can be opened and voted, to help the team prioritize new OS support.