How can I typehint a parent basemodel such that a child subclass can provide defaults for some of the fields:

from pydantic import BaseModel


class Parent(BaseModel):
    first: str
    second: str
    third: str

    def run(self):
        print(self.first + self.second + self.third)


class Child(Parent):
    first = "1"
    second = "2"


c = Child(third="3")  # mypy: Missing named argument "first" for "Child" & Missing named argument "second" for "Child"