Creating Dynamic Content leveraging Javascript

Javascript gives you the option to do anything in Storyline. Zsolt Olah's 99 tips are a good place to start your journey. https://www.rabbitoreg.com/examples/p99/#/

And indeed its true that Articulate doesnot support custom Javascript... but in my opinion thats more self-protection for too many Javascript related questions then anything else. Especially if you dive deep into the Articulate Storyline code, its all Javascript based.

Biggest issue you have to be aware of is scope. As each trigger and slide has its own scope that for sure can be a nuisance. Offcourse you can workaround that, but you for sure need to be aware of it.

Variables are your best bet indeed to get things done in combination with Javascript. As you can set and get them with JS, its quite easy to trigger default Storyline functions.