[Python] Default values for TypedDict

Let's consider I have the following TypedDict:

class A(TypedDict):
a: int
b: int


What is the best practice for setting default values for this class?

I tried to add a constructor but it doesn't seem to work.

class A(TypedDict):
a: int
b: int
def __init__(self):
TypedDict.__init__(self)
a = 0
b = 1


EDIT: I don't want to use dataclass because I need to serialize and deserialize to JSON files and dataclasses have some problem with it.

What do you think?

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