Add QueryString documentation when using TransferObject with @ModelAttribute as single argument

[angelomarzocchi]

I'd like to add OpenAPI documentation to my project but I have the following problem :
I have a lot of RestController where th eonly input of the methods is a TransferObject with the @ModelAttribute annotation to map each field of the Transfer Object as a query parameter. In my real life scenario not every field is used for every request, so I would like to add some sort of documentation to specify which fields are used .
I have no idea how to achieve this result, can someone help ?
I'd like to add annotation to the RestController class, leaving the TO as it is.
Here I have an example of what I have in my project : https://github.com/angelomarzocchi/springdocdemo
And this is the documentation I have right now :

openapi: 3.0.1
info:
 title: OpenAPI definition
 version: v0
servers:
- url: http://localhost:8080
 description: Generated server url
paths:
 /product:
   get:
     tags:
     - product-controller
     operationId: getProductTOsByFilter
     parameters:
     - name: filter
       in: query
       required: true
       schema:
         $ref: "#/components/schemas/ProductTO"
     responses:
       "200":
         description: OK
         content:
           '*/*':
             schema:
               type: array
               items:
                 $ref: "#/components/schemas/ProductTO"
components:
 schemas:
   ProductTO:
     type: object
     properties:
       productID:
         type: string
       productName:
         type: string
       weight:
         type: number
         format: float
       description:
         type: string

The result I want is to have productID and productName as parameters in the yml documentation.
Something like :

openapi: 3.0.1
info:
 title: OpenAPI definition
 version: v0
servers:
- url: http://localhost:8080
 description: Generated server url
paths:
 /product:
   get:
     tags:
     - product-controller
     operationId: getProductTOsByFilter
     parameters:
     - name: productID
       in: query
       required: false
     - name: productName
      in: query
      required: false
     responses:
       "200":
         description: OK
         content:
           '*/*':
             schema:
               type: array
               items:
                 $ref: "#/components/schemas/ProductTO"
components:
 schemas:
   ProductTO:
     type: object
     properties:
       productID:
         type: string
       productName:
         type: string
       weight:
         type: number
         format: float
       description:
         type: string

Thank you everyone in advance