Hello.

I would like to know if it's possible to split the config.yaml in several files (the main config in one file, acl and views section in another, data-local section with rpz lists and tags to rely acl lists to blocklists in another), and if the answer is yes, how can I do ?

Currently it's not possible.  You could of course use some generator that produces the config.yaml, but that's of course less ergonomic.

Incidentally we have this WIP:
https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1710

--Vladimir