multipart/form-data request body with [FromForm] complex type is generated inline instead of referencing the model schema #3100

We have an endpoint that accepts multipart/form-data, with the request bound to a model:

public async Task<IResult> Add([Required][FromForm] AddRequest request)

The generated OpenAPI document does not reference the AddRequest schema in the request body. Instead, the schema is generated inline/generic, so the model is not reusable or identifiable by clients and code generators.

Expected behavior

The request body for multipart/form-data should reference the defined model via $ref:

"requestBody": {
  "required": true,
  "content": {
    "multipart/form-data": {
      "schema": {
        "$ref": "#/components/schemas/AddRequest"
      }
    }
  }
}

Actual behavior

The schema is emitted inline (or as a generic object) and AddRequest is not referenced from components/schemas.

Question

Is it possible (or planned) to have the request body reference the defined model for [FromForm] complex types? If there is a supported configuration or transformer-based workaround, guidance would be appreciated.

Environment

.NET version: 10.0.300
Package and version: Microsoft.OpenApi 2.11.0
API style: Controllers