I have not been figured out how external TLDs, containing in jar files, can be added to the Red Hat Palette. Can we only add TLDs which are located under our imported projects ? I don't have TLDs in my projects, but I have TLDs (packed in jars) somewhere in Maven local repository.

Sure, I can unpack any jar file, get the TLD file and then import it to rhds palette. But firstly, I have to place all unpacked TLDs into my project (so that Red Hat will be able to find them) and secondly, why Red Hat can't do that for me ? I want to import jar files with 3td party components directly.