Integrate FXSL into phpStorm globally or any other way? Follow

I am new to XSLT and XPATH and currently working through a Pluralsight course done by Dimitre Novatchev ("XSLT 1.0 and 2.0 Foundations"), who also did the FXSL library. It is this library that i try to implement into the phpStorm IDE in order to evaluate xpath expression on the IDE's XSLT plugin's command line, but so far I have not been successful.

The files of the downloaded fxsl (https://sourceforge.net/projects/fxsl/files/XPath%20Visualizer%202/) reside in the project folder, but I have no idea how to let phpStorm (or the respective plugin) know that there is alibrary to import.

Any tips for me?

Thanks!