I try to achieve multi level JSON script from datawindow. It suppose to looks like a family tree:

[
  {
     name: "Canada",
     people: [
       {
          name: "Steve",
          children: [
            {
               name: "Linda",
               children: [
                 {
                    name: "Steve, Jr.",
                    friends: [
                      {
                         name: "Kriss"
                      }
                      //, more friends
                    ]
                 }
                 //, more grandchildren
               ]
            }
            //, more parents
          ]
       }
       //, more grandparents
     ]
   }
   //, more countries
 ]

I created a group for each level in the datawindow.

Group 1 = Countries,

Group 2  = People,

Group 3 = Children ...

When I perform  dw_1.ExportJson()  It doesn't creates array inside array.

Is there any way to implement it, or Powerbuilder supports only two levels?