It’s on my todo list to integrate with more tools that can improve the quality of the JavaScript written in Scriptable. It’s not on the top of my list right now but it’s certainly not at the bottom either 
If you want to automatically add all keywords, you can take a look at https://docs.scriptable.app/scriptable.json which contains a Tern language definition for Scriptable’s APIs. You can probably fairy easily map it to whatever format you need.