how to add word expansions or composite word corrections

[Jopp-gh]

I'm wondering how to add word expansions or composite word corrections to a given language, be it German or Italian or Chinese of English or any other language?

I checked the onnx.json file for keywords to add my changes but didn't find any. If that json file is usable, where online should I find the relevant keywords to add my exceptions?

I mean...instead to train voices another time, wouldn't it much better to add exceptions to the .onnx.json file? - (big question mark)