How to reference non-route parameter to ignore?

[lab08Pavel]

use Spatie\LaravelData\Data;

class UserData extends Data
{
    public function __construct(
        public string $name,
        #[Email, Unique('users', 'email', ignore: <id from below>)]
        public string $email,
        public ?int $id = null,

I don't have access to the user id in my route, this is a PUT /api/profile route, so I can't use RouteParameterReference.
I also can do request()->get() in an annotation.
Is my only option do define rules() method instead?

[rubenvanassche]

I'm afraid so, there's no concept of the data available when generating these rules so the only thing we can do is referencing other field names but not their values.