What would you like to do exactly? If I understand your intentions correctly, so you would like to add custom functionality to the editor, I'm affraid the only way is C++.
At a very basic level I'd like to pass things like the exported json shader parameters in from substance painter but i'd like to make more complicated stuff later on..
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If I understand your intentions correctly, so you would like to add custom functionality to the editor, I'm affraid the only way is C++.