Thanks @ravenstar68 for your answer 
Do you have any more specific information on how to create a zone file for my reverse zone ?
Since I am happy with my MIAB server being a DNS server, I don’t see why I shall use another external service to do so…also if I get to learn new knowledge in the meantime it is valuable.
MIAB is about re-decentralising the internet and I am more than happy to continue to do so.