[Python] How can a duration scalar from Django models be implemented for Strawberry GQL?

How can Django duration model fields be exposed in a Strawberry GraphQL API? Is there a standard implementation for the ISO8601 duration format or does a custom scalar field need to be implemented?

from django.db import models

class MyModel(models.Model):
name = models.CharField(max_length=255)
my_duration = models.DurationField()

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