在Django中,如何在没有显式查询的情况下从多对多关系中的额外字段中检索数据？

from django.db import models

class CustomRelation(models.Model):
    person = models.ForeignKey(Person, on_delete=models.CASCADE)
    group = models.ForeignKey(Group, on_delete=models.CASCADE)
    extra_field = models.CharField(max_length=100)

from django.db import models

class Person(models.Model):
    name = models.CharField(max_length=100)
    groups = models.ManyToManyField(Group, through=CustomRelation)

class Group(models.Model):
    name = models.CharField(max_length=100)
    members = models.ManyToManyField(Person, through=CustomRelation)

person = Person.objects.get(name="John")
groups = person.groups.all()

for group in groups:
    custom_relation = CustomRelation.objects.get(person=person, group=group)
    extra_field_data = custom_relation.extra_field