[Python] Extend Marshmallow Schema but Override Field Required Property

Noob question, but I have a simple schema:

class User(Schema):
name = fields.Str(required=True)
email = fields.Str(required=True)


And I want to extend it, but in the extended case make a field optional

class UserIHavePhoneNumberFor(User):
phone = fields.Str(required=True)
# Don't Care about Email because I can pester them via phone!


I've checked the docs but can't find a way to do this. Any help?

Thank you!

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