How can i connect my json object data?

Example
"kindAttn": {
"label": "Jerry",
"value": "629f0f65fd91257cc17a2542"
}

this is an example for stored data now i'll try to relationship with users table using this kindAttn value so how can i do that?

Here is my code for relation

/**
 * @return \Jenssegers\Mongodb\Relations\HasOne
 */
 public function kindAttnDetails()
 {
 return $this->hasOne(ContactPerson::class,'_id','kindAttn->value');
 }