ah, that's awesome! fwiw I don't think that setup is mutually exclusive from the hackmd doc --
g0v.tw (or any other domain) would have only one entry in a doc like the one i linked, to show who has admin access. And aside from domains, it's also for making [mostly] clear who has access to all the social and infra services/platforms, so non-old-timers can know who to talk to about things
for example, it might document who has admin login access to the
grants.g0v.tw website, which someone was trying to help me with earlier today 🙂