{
   "prototypes":{
      "form[child1][__name__][additionalFields]":[
         {
            "display":[
               "form[child1][__name__][additionalFields]"
            ],
            "values":[
               1
            ]
         }
      ],
      "form[child2][__name__][additionalFields]":[
         {
            "display":[
               "form[child2][__name__][additionalFields]"
            ],
            "values":[
               1
            ]
         }
      ]
   }
}