How to overwrite domain_abstract ui Input component?

Domain abstract stuff are just for internal usage so I don't even plan to let them overwritable, which is your use case?

I want to customize the appearance of the form fields in the settings panel of a component, by using existing classes in bootstrap or another css framework I use.

So I want to replace gjs-field with form-group

Ok, got the case, but at the moment there is just no easy way to accomplish it :/