Who maintains architecture IDs (and OS ABIs) for ELF format now?

The latest [spec for ELF](https://www.sco.com/developers/gabi/latest/ch4.eheader.html) list many architectures that can be used with it, but some self-assignments are made in the wild (e.g. [Chinese LoongArch](https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html#_e_machine_identifies_the_machine)) . Is there anyone coordinating these assignments? LANANA doesn't seem to have such list, or am I missing something?