Polymorphic serializers example

[unrealsolver]

Hello, I am trying to have a polymorphism inside the serializers.ListField. What is an idiomatic way of having a list of A | B values? For example in OpenAPI something like

results:
  type: array
  items:
    allOf:
      - $ref: '#/components/schemas/MyPolymorphicResult'
    readonly: true
...
MyPolymorphicResult:
  oneOf:
    - $ref: '#/components/schemas/VariantA'
    - $ref: '#/components/schemas/VariantB'
  discriminator:
      propertyName: type
      mapping:
        'variant_A': '#/components/schemas/VariantA'
        'variant_B': '#/components/schemas/VariantB'

So, in the serializer class it should be something like

results = serializers.ListField(child=MyPolymorphicSerializer())

But in this case MyPolymorphicSerializer should somehow dispatch between two variant serializer classes.
Using SerializerMethodField would also require copying parts of ListSerializer, which will lead to a divergency with DRF updates.