Specifying multiple content-types in itty-router-openapi responses

I'm looking to return response content-type conditional on request accept header. OpenAPI spec has an example https://swagger.io/docs/specification/describing-responses/
get:
      summary: Get all users
      responses:
        '200':
          description: A list of users
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ArrayOfUsers'
            application/xml:
              schema:
                $ref: '#/components/schemas/ArrayOfUsers'
            text/plain:
              schema:
                type: string

but I can't find a way to accomplish that with itty-router-openapi response format. I tried something like
responses: {
      '200': {
        content: {
          'application/json': {
            schema: new Obj({
              type: new Str({ description: "the type of object", default: 'foo', example: 'foo' }),
            })
          },
          'text/plain': {
            schema: { type: 'string' }
          },
        },
      },

but it seems that the object with the status code key must satisfy
export interface ResponseSchema {
    description?: string;
    schema?: Record<any, any>;
    contentType?: string;
}

Is there a way to specify multiple content types there?
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