I found a solution for this. The data has to be in json format literally:
"{"Type":[{"key":"cType","value":"Age"}]}"
I created a class serialized it and then finagled the square brackets in.
Public Class cType
Private _key As String
Public Property Key() As String
Get
Return _key
End Get
Set(ByVal value As String)
value = "cType"
_key = value
End Set
End Property
Public value As String
End Class
Dim objType As cType = New cType
objType.value = "Age"
Dim myData As String = deserializer.Serialize(New With {.cType = objType})
myData = myData.Insert(12, "[")
myData = myData.Insert(myData.Length - 1, "]")