How to merge multiple models in serializer/view Django REST Framework?

I'm a newbie, please don't throw me slippers. The example is degenerate, but... there is a post model with text and owner. Each post is associated with its address, so the coordinates of the post are stored in a separate table. At this stage I can create a post with coordinates by overriding the create() method.

# models.py

    User = get_user_model()
    class Post(models.Model):
        owner = models.ForeignKey(User, on_delete=models.CASCADE)
        description = models.TextField(null=False, blank=True)
    
    
    class Address(models.Model):
        post = models.OneToOneField(Post, on_delete=models.CASCADE)
        lat = models.FloatField('Latitude', blank=True, null=True)
        lng = models.FloatField('Longitude', blank=True, null=True)

# serializer.py

    class AddressDetailSerializer(serializers.ModelSerializer):
        class Meta:
            model = Address
            fields = [
                'lat',
                'lng',
            ]
    
    
    class PostDetailSerializer(serializers.ModelSerializer):
        owner = serializers.HiddenField(default=serializers.CurrentUserDefault())
        addr_point = AddressDetailSerializer(many=False)
    
        class Meta:
            model = Post
            fields = [
                'id',
                'description',
                'owner',
                'addr_point',
            ]
    
        def create(self, validated_data):
            addr_point_data = validated_data.pop('addr_point')
            post = Post.objects.create(**validated_data)
            Address.objects.create(post=post, **addr_point_data)
            return post
# views.py

    class PostCreateView(generics.CreateAPIView):
        queryset = Post.objects.all()
        serializer_class = PostDetailSerializer

Now, I am completely clueless on how to display information about each post in the following format:

{
"owner": "admin"
"description": "blablabla",
"addr_point": {
"lat": 123,
"lng": 123
}
}

None of my serializer/view variants work or output the coordinate field.

UPD: For example, I use the following view to get information about some posts:

# view.py    
class PostDetailView(generics.RetrieveUpdateDestroyAPIView):
        serializer_class = PostDetailSerializer
        queryset = Post.objects.all()

But I get AttributeError: 'Post' object has no attribute 'addr_point'.

I'll be happy to get tips on which direction to move!