Hi,
to my knowledge, ddns is only capable of updating IPv4 (and IPv6?) addresses,
as there usually is no need for keeping TXT records up to date if your public
IP address changes.
Some DNS providers have APIs for such tasks. Not sure if all-inkl does so as well,
but if they do, you most likely need an ACME client supporting their API.
Thanks, and best regards,
Peter Müller