Adding to existing JSON from excel - json

Question

I want to add to this JSON file in excel using vba.
So I have this JSON file
{
"root": [{
"STATUS_RESPONSE": {
"STATUS": {
"STATUS": {
"OWNER": "root"
}
},
"REQ_ID": "00000",
"RESULT": [{
"USER": {
"BUSINESS_ID": "A",
"USER_NUMBER": "45",
"LANGUAGE": "F"
}
},
{
"USER_SESSION": {
"USER_ID": "0000001009",
"HELP_URL": "http://google.com"
}
},
{
"USER_ACCESS": {
"SERVICES_ROLE": "true",
"JOURNALLING": "true"
}
}]
}
}]
}
I want to add another "USER" right below it so it looks like
{
"root": [{
"STATUS_RESPONSE": {
"STATUS": {
"STATUS": {
"OWNER": "root"
}
},
"REQ_ID": "00000",
"RESULT": [{
"USER": {
"BUSINESS_ID": "A",
"USER_NUMBER": "45",
"LANGUAGE": "F"
}
},
{
"USER": {
"BUSINESS_ID": "B",
"USER_NUMBER": "55",
"LANGUAGE": "E"
}
},
{
"USER_SESSION": {
"USER_ID": "0000001009",
"HELP_URL": "http://google.com"
}
},
{
"USER_ACCESS": {
"SERVICES_ROLE": "true",
"JOURNALLING": "true"
}
}]
}
}]
}
This is what I have currently
Private Sub CommandButton3_Click()
Dim z As Integer, items As New Collection, myitem As New Dictionary
Dim rng As Range
Dim cell As Variant
Dim FSO As New FileSystemObject
Dim JsonTS As TextStream
Set JsonTS = FSO.OpenTextFile("test.json", ForReading)
JsonText = JsonTS.ReadAll
JsonTS.Close
Set JSON = ParseJson(JsonText)
Set rng = Range("A5")
z = 0
For Each cell In rng
myitem("BUSINESS_ID") = cell.Offset(0, 1).Value
myitem("USER_NUMBER") = cell.Offset(0, 2).Value
myitem("LANGUAGE") = cell.Offset(0, 3).Value
items.Add myitem
Set myitem = Nothing
z = z + 1
Next
myfile = Application.ActiveWorkbook.Path & "\test.json"
Open myfile For Output As #1
Print #1, ConvertToJson(myitem, Whitespace:=2)
MsgBox ("Exported to JSON file")
Close #1
End Sub
All this does is add it below the existing JSON and is not connected to it all.
How would I go about add another "USER" right below the current one with the information from excel