I wish I had a better answer, but not currently. If we did want some notion of “this is assigned to me”, then we would have to do something like github issues per package, and that’s not really feasible.
In the past we attempted to generate a VERY long checklist of packages, but that’s not easy to maintain, and only people with write access can actually update the checklist. Zero Hydra Failures: 19.09 edition · Issue #68361 · NixOS/nixpkgs · GitHub