Specifying multiple content-types in itty-router-openapi 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

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' }
          },
        },
      },

export interface ResponseSchema {
    description?: string;
    schema?: Record<any, any>;
    contentType?: string;
}