interface ValueTransformerInterface
{
    public function transform(mixed $value, array $options = []): mixed;

    public static function getJsonValueType(): Type;
}

#[\Attribute(\Attribute::TARGET_PROPERTY)]
class ValueTransformer
{
    // ...

    public function __construct(
        callable|string|null $toNativeValue = null, // can be a callable or a ValueTransformerInterface service id
        callable|string|null $toJsonValue = null, // can be a callable or a ValueTransformerInterface service id
    ) {
        // ...
    }

    // ...