including list of nested when serializing

[g-brizolier]

I am using json:api with python with a class that looks like this:

class ChildrenResultSerializer(JSONAPISerializer):
  children = fields.List(fields.Nested(ChildSerializer), allow_none=True)

and the other one looks like this:

class ChildSerializer(JSONAPISerializer):
    toys = fields.Relationship(
        many=True,
        type_="toys",
        include_resource_linkage=True,
        schema=ToySerializer,
        allow_none=True,
    )

In the ChildrenResultSerializer.serialize function, I want to be able to see the toys data for each of the children. I'm using it like this:

ChildrenResultSerializer.serialize(results, include_data=("children.toys"))

but I get this error: ValueError: Can only include relationships. "children" is a "List"

what am I doing wrong? I would like to keep children as a list of nested if possible.