How can I access attributes in intermediate class

class User(models.Model):
name = models.CharField(max_length=128)

class Group(models.Model):
name = models.CharField(max_length=128)
members = models.ManyToManyField(User, through='Membership')

class Membership(models.Model):
person = models.ForeignKey(User)
group = models.ForeignKey(Group)
date_joined = models.DateField()

What if I want to access Membership.data_joined in Group class?

Thanks

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