Thank you @rlkoshak!
I’ll give it a try but definitely it sounds what I was looking for. I missed your OH 3 Examples: Writing and using JavaScript Libraries in MainUI created Rules post talking about it but I’ve found it now 
It’s a “pity” I started with DSL rules (I’m new with OH and I pick that choice because it seems to be more examples with them) but definitely seems learning JS will be very helpful.
