Will it be possible to use .tmGrammar.json instead of the xml based variant?
We have no plans currently to support TextMate grammars. As of version 10, Nova supports Tree-sitter grammars, which are capable of far richer language support. The older Nova XML regular expression grammar format is effectively deprecated at this point in favor of Tree-sitter.
. Was worth a shot, guess I better learn how to tree-sitter 
Yeah, sorry to bear bad news. Nova’s original XML format is not technically compatible with TextMate grammars (whether the original XML ones, or VSCode/Atom’s conversions to JSON or CSON). It was a homegrown engine of its own that worked similarly.
We began the move to Tree-sitter last year after long considerations about what would be the most robust and forward-looking. We didn’t have the engineering capability to build engine support for both Tree-sitter and TextMate, unfortunately.
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Yeah that makes complete sense to be honest, I think tree-sitter is certainly the way to go as well. Just means I have to not be a potato hahah