Alright, I tried to make a syntax mistake once a gain (I added: balaslm "as’ assas) to /var/etc/config/resolver then restarted unbound - unbound-checkconf didn’t give me any warning. Then I made the same syntax mistake in my included unbound conf file and after that I got errors. So as you said, its related to UCI.
Thank you Ondřej for the explanation.
I thought that the syntax of the unbound conf. parameters depends on unbound as an application. (I gotta learn more about UCI) Anyway you’re right, QName works when its written in another conf file.