api-platform-serialization-groups-dynamic.php

<?php

namespace App\Entity;

use ApiPlatform\Core\Annotation\ApiResource;

/**
 * @ApiResource(
 *     collectionOperations={
 *         "get",
 *         "post"
 *     },
 *     itemOperations={
 *         "get",
 *         "get_custom"={"method"="GET", "path"="/my-entity/{id}/custom"},
 *         "put",
 *         "put_custom"={"method"="PUT", "path"="/my-entity/{id}/custom"}
 *     }
 * )
 */
class MyEntity {
    // stays identical   
}