How to combine the django methods "prefetch_related" and "values"?

Question

How to apply the prefetch_related and values ​​method in combination?

I used to have the following code. The field constraint in this query is required to optimize performance.

Organizations.objects.values('id','name').order_by('name')

Now I need to pre-select its union and add it to the serializer using the prefetch_related method.

Organizations.objects.prefetch_related('locations').order_by('name')

Here I cannot find a way to limit the fields after using "prefetch_related".

I tried the following, but the serializer does not see the associated "locations".

Organizations.objects.prefetch_related('locations').values("id", "name").order_by('name')

Skeleton Models:

class Organizations(models.Model):
        name = models.CharField(max_length=40)

    class Location(models.Model):
        name = models.CharField(max_length=50)
        organization = models.ForeignKey(Organizations, to_field="name", db_column="organization_name", related_name='locations')
        class Meta:
            db_table = u'locations'