Is where a build in way to deserialize nested object with type hint property?

I am trying to convert data from json to DTO class. I am using Symfony serializer.

But when I am trying to deserialize. It does not parse type from typed property, I guess Symfony does not support deserialization form typed property yet. Is it so? Do I have to implement my one?

DTO:

class ElkUser
{
    public string     $partnerUuid;
    public string     $contractUuid;
    public DealerInfo $dealerInfo;
}

class DealerInfo
{
    public string $description;
    public int $dealerId;
    public string $dealerName;
    public bool $enabled;
    public string $registrationDate;
}

Serializer config:

$normalizers = [
    new DateTimeNormalizer(),
    new ObjectNormalizer(
        null,
        null,
        null,
        new ReflectionExtractor
    ),

];

$serializer new Serializer($normalizers, [new JsonEncoder()]);

The test case when give me error:

TypeError : Typed property App\Services\CreditPilot\ElkUser::$dealerInfo must be an instance of App\Services\CreditPilot\DealerInfo, array used

$json = <<< JSON
{
  "partnerUuid": "string",
  "contractUuid": "string",
  "dealerInfo": {
    "dealerId": 0,
    "dealerName": "string",
    "enabled": true,
    "registrationDate": "2020-03-10T12:49:08.367Z",
    "contract": {
      "contractNumber": "string",
      "enabled": true,
      "creationDate": "2020-03-10T12:49:08.367Z"
    }
  }
}
JSON;

$serializer->deserialize($json, ElkUser::class, 'json');