Is there something like JSON scalar type ? #882

<?php
declare(strict_types=1);
namespace App\GraphQL\Scalar;
use GraphQL\Language\AST\BooleanValueNode;
use GraphQL\Language\AST\FloatValueNode;
use GraphQL\Language\AST\IntValueNode;
use GraphQL\Language\AST\ListValueNode;
use GraphQL\Language\AST\ObjectValueNode;
use GraphQL\Language\AST\StringValueNode;
use Overblog\GraphQLBundle\Annotation as GQL;
#[GQL\Scalar]
#[GQL\Description('Json scalar type')]
class Json
{
 public static function serialize($value)
 {
 return $value;
 }
 public static function parseValue($value)
 {
 return $value;
 }
 public static function parseLiteral($valueNode)
 {
 switch ($valueNode) {
 case $valueNode instanceof StringValueNode:
 case $valueNode instanceof BooleanValueNode:
 return $valueNode->value;
 case $valueNode instanceof IntValueNode:
 case $valueNode instanceof FloatValueNode:
 return \floatval($valueNode->value);
 case $valueNode instanceof ObjectValueNode:
 $value = [];
 foreach ($valueNode->fields as $field) {
 $value[$field->name->value] = self::parseLiteral($field->value);
 }
 return $value;
 case $valueNode instanceof ListValueNode:
 return \array_map([self, 'parseLiteral'], $valueNode->values);
 default:
 return null;
 }
 }
}