google cloud apigateway with dynamic endpoints

Question

I am using the google apigateway with the following structure: an endpoint called 'product' and then a product id. Hence each product gives a different url. E.g. my first product might be https://www.my-endpoint/product/1 and the second would be https://www.my-endpoint/product/2

I know how to do this if it was a parameter based endpoint. If the endpoint was called product-info, and had a unique product number, I could do something like the following, and pass in a parameter. E.g. https://www.my-endpoint/product-info?productid=1 to get the info of the first product, but I can't figure out what to do when it's a different url for what would be each query parameter

 "/product-info":
    get:
      x-google-backend:
        address: https://my-endpoint/product-info
      operationId: "product-id-endpoint"
      parameters:
        -
          name: iataCode
          in: query
          required: false
          type: string
      responses:
        200:
          description: "Success."
          schema:
            type: string
        400:
          description: "Failed"

Is this not possible? I can make it work on AWS apigateway, thought it should be possible on google cloud as well