b4 maintainer and Director of LF IT Konstantin Ryabitsev demo-ed git-bug support in b4 and cgit (kernel.org fork) just this week at the Kernel Recipes conference:

https://b4.docs.kernel.org/en/latest/maintainer/bugs.html

https://git.kernel.org/pub/scm/utils/b4/b4.git/bugs/

https://kernel-recipes.org/en/2026/2026/09/22/live-blog-day-... (shameless plug)