I have created a new route with this code:

register_rest_route(
    'namespace',
    'some-route',
        [
            'methods'             => WP_REST_Server::CREATABLE,
            'callback'            => 'some_callback',
            'args'                => [
                'description' => [ 'type' => 'string', 'required' => true ],
                'length' => [ 'type' => 'integer', 'required' => true ],
            ],
        ]
);

It uses a built-in data validation feature. Currently, when the validation fails it sends a response with some data and the status code 400.

How to change the built-in validation response status to 406?