Why?

Agree it’s not that complicated Many ddns providers can update aaaa just as they do a records… Most isp should either be providing some range of native ipv6 addresses, or some kind of 4-to-6 translation. It’s 2024 - we’re beyond RFC 791 specs I find it helpful to deal with prefix delegation by providing a “token” for nmcli to use. Then the ddns script can locate your defined suffix and push it to to the host

If it isn’t meant for others to see, what’s wrong with a .txt file you just add notes to?