How to add id field to JsonObject using SORM in play framework on scala?

Question

this is my case class:

case class Admin(name: String, surname: String, login: String, password: String

this is my json formatter:

implicit val adminWrite: Writes[Admin] = (
      (JsPath \ "name").write[String] and
      (JsPath \ "surname").write[String] and
      (JsPath \ "login").write[String] and
      (JsPath \ "password").write[String]
    )(unlift(Admin.unapply))

what i get:

{
name: "ddd",
surname: "ddd",
login: "djamik123",
password: "djamik123"
}

what i need:

{
id: 1,
name: "ddd",
surname: "ddd",
login: "djamik123",
password: "djamik123"
}

Is there a way to solve this problem?