Hey @LittleDeveloper
First: If you have problems with the Custom Scripts, please consider opening a new thread. Don’t necro-bump unrelated ones. Check https://forum.camunda.io/faq for our contribution guidelines.
Second: What excactly do you mean with “variable that references my library”? The post you are replying to shows a requireJS definition. You can rename jQuery to foobar in the config if you want to. It just loads a JS file. Check the requireJS documentation and Custom Script Documentation for more details.
Cheers
Martin