'Print keys were values is null in map<String,dynamic> Employee in dart

This is the code json code from which I want to get all the keys were value is null

{
   "service": "register",
   "employee": {
       "employeeId": "bcvfevse",
       "officeId": null,
       "email": null,
       "name" : "Chetan Patil",
       "position" : "Flutter Developer",
       "number" : null
   },
   "device": {
       "type": "android",
       "uniqueId": "9774d56d682e549c"
   }
}

I Want something like this ["number","email","officeId"] in "DART"

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'Print keys were values is null in map<String,dynamic> Employee in dart

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