Add modifier for custom type hint (Python)

[ccrvlh]

First, thanks a lot, this is actually a whole lot better than the default.
The only thing I'm missing is a modifier to make custom type hints the same color as native type hints.
I've the that way to do that is through modifiers, but couldn't customize it in the settings.
I could also contribute with a bit of guidance on how to.
Thanks!

[tcd]

@lowercase00 could you provide some example code?