Starting Katalon Studio 5.7, Cucumber API is supported as an part of Katalon studio out-of-box, meaning, you dont really have to add any cucumber library to Katalon studio as an external JAR reference, rather, its available within Katalon studio.
This repo contains the complete demostration of working with Cucumber BDD in Katalon Studio 5.7
Here is the complete video explaning how to get started with Cucumber in Katalon studio https://www.youtube.com/watch?v=vwCSfUhsivY