Is it possible to pull out types as a variable of sorts, and use them as typing for functions?

I’ve tried what I thought would make sense, but it doesn’t work:

DayOfWeek = Literal["sunday", "monday", "tuesday", "wednesday", "thursday", "friday", "saturday"]

def get_closest_day_by_day_of_week(
    date: datetime,
    day_of_week: DayOfWeek # <--- this does not work
):
    pass