Valid JSON usable from VA Rest for your data would look like this.
I find JSONLint is useful for testing JSON structure and formatting. Hope this helps a bit. Good luck!
{
"array": {
"object1": {
"DATA1": 120,
"DATA2": "56",
"DATA3": 26
},
"object2": {
"DATA1": 137,
"DATA2": "754",
"DATA3": 84
}
}
}