OBJECT
ProductPriceListReference
Id and name of one price list a product is priced in (PLW-40040).
Only the GraphQL / OpenAPI shape - the value itself stays the {id, name} dict the
aggregation produces (RelatedProductPriceLists.declared_attr_expression), which is
also what the grid renders. Keeping the dict rather than instantiating this class means
to_dict (REST), the csv / xlsx exporters and types_ex.product_price_lists all
keep working on one payload; dict_resolver lets graphene read it.