Api Gateway - support for allOf & oneOf

As per this documentation https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-known-issues.html#api-gateway-known-issues-rest-apis , it mentions there's no support for oneOf property when defining API specs with OpenAPI 3.0.

There's no mentioning of the allOf property, but support for it seems to be partial: if I compose the root schema model with allOf, the corresponding endpoint will end up with no model attached to the request body at the API GW side. However, if I define some sub-property of the root model with allOf, that seems to work.

Example (hand written yaml so indentations not correct, but you'll get the idea):

schemas:
  # This does not work
  NotWorkingModel:
    allOf:
      - type: object
        properties:
          foo:
            type: string
       - type: object
         properties:
           bar:
             type: string
   
   # This works
   WorkingModel:
     type: object
     properties:
       foo:
         allOf:
            - type: object
               properties:
                 bar:
                   type: string
            - type: object
               properties:
                  jar:
                    type: string

My main question is: will there be any plans getting these oneOf & allOf properties fully supported when defining REST API specs with OpenAPI?