You can locate any external libraries in the <projectDir>/Drivers folder. Katalon Studio recognizes these jars and bring them accessible for the user codes. See the following doc. This is the principal way for users to import the external dependencies into a Katalon project.
This approach could be problematic when you imported multiple jar versions of a single OSS project, as the following post discusses:
I wanted to use the latest version 2.13.0 of commons-io, while the older version 2.6.0 of commons-io was bundled in the distributable Katalon Studio. Katalon Studio primarily refers to the bundled older version.
Katalon provides a way to exclude the budled jar to prefer another jar in the Drivers folder, but this fails when you run your project on a remote server with KRE as CI/CD pipeline. This post reported it.