Add Annotation to CustomField instance

[pbrochar]

Hello,

Thanks for this library. I want to access to the Annotation parameters inside the use function of a CustomField subclass.

class Custom(CustomField):
    param_name: str

    def use(self, /, *,  **kwargs: Dict[str, Any]) -> Dict[str, Any]:
       self.param_type # Here I want access to the parameter type
       ...

Where my function is:

def func(a: int, b: Annotated[str | None, Custom()]):
    ....

Is it possible ?

Thanks!