How to convert between dataclasses in python that inherit from each other?

What is the right way to convert between dataclasses in python that inherit from each other (without repetitive code)?

Example:

from dataclasses import dataclass

@dataclass
class Parent:
    p1: int
    # …

@dataclass
class Child(Parent):
    c1: int
    # …

My attempt:

# Fail: How to call the parent constructor (like in C++)?
def make_child(parent: Parent, c1: int, …) -> Child:
    return Child(
        p1=parent.p1,
        # …
        c1=c1,
        # …
    )

# Fail: How to implicitly cast to parent (like in C++)?
def get_parent(child: Child) -> Parent:
    return Parent(
        p1=child.p1,
        # …
    )

I know that this would be easy with composition instead of inheritance, but that's not my question.