How can I use the ref examples in response

So examples in responses are supported, but $refs _within_ examples are not allowed as it isn't possible to distinguish between the example itself and the special keywords (like $ref).

See bottom of the https://swagger.io/docs/specification/2-0/adding-examples/?sbsearch=Examples page.

However, as for examples in responses... here is a quick sample:

openapi: 3.0.3
info:
  title: Examples
  version: 1.2.3
  description: Using examples with $refs in responses.
  
paths:
  /foos:
    get:
      description: Get Foos
      responses:
        '200':
          description: A list of Foos
          content:
            application/json:
              examples:
                FirstExample: 
                  $ref: '#/components/examples/SomeExample'
components:
  examples:
    SomeExample:
      value:
      - one
      - two