如何在Symfony的API平台响应中添加计算属性？

use ApiPlatform\Core\Annotation\ApiProperty;
use ApiPlatform\Core\DataTransformer\DataTransformerInterface;

class CustomPropertyCalculator implements DataTransformerInterface
{
    public function transform($object, string $to, array $context = [])
    {
        // 计算属性的值
        $computedValue = // 计算逻辑

        // 创建一个新的对象，包含计算属性
        $newObject = clone $object;
        $newObject->computedProperty = $computedValue;

        return $newObject;
    }
}

class MyResource
{
    /**
     * @ApiProperty(get="App\CustomPropertyCalculator::transform")
     */
    public $computedProperty;
}

/**
 * @ApiResource(
 *     collectionOperations={
 *         "get"={
 *             "normalization_context"={
 *                 "groups"={"my_resource_read"}
 *             }
 *         }
 *     },
 *     itemOperations={
 *         "get"={
 *             "normalization_context"={
 *                 "groups"={"my_resource_read"}
 *             }
 *         }
 *     }
 * )
 */
class MyResourceController
{
    // 控制器逻辑
}