Jagged Array (non Variant) possible in VB6?

Background: From a VB6 app, I need to pass a jagged array to a dot net component with a com interface

The dot net array is structured like this example:

Code:

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New Double()() {New Double() {0.5, 0.0, 0.4, 0.4, 0.0, -8.0}, _
                      New Double() {0.4, 0.0, 0.3, 0.0, 0.6, -1.0}, _
                      New Double() {0.2, 0.2, 0.0, 0.3, 0.3, -4.0}}

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I tried stuffing double type arrays into individual elements of a variant array in my vb6 app to pass to the dot net app, but the dot net app rejected it with a cant convert object to double error.

Is there a way to make a true double type jagged array in vb6?

I'm no pro programmer but I have never come across the term 'jagged array' until now. As far as I can tell it's an array of arrays which you could create in VB6 with a UDT.

Code:

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Option Explicit
Private Type tDblArray
  Arr() As Double
End Type

Private Sub Form_Load()
Dim D() As tDblArray
  ReDim D(2)
 
  ReDim D(0).Arr(1)
  D(0).Arr(0) = 1.23456
  D(0).Arr(1) = 2
 
  ReDim D(2).Arr(3)
  D(2).Arr(0) = 1
  D(2).Arr(1) = 2
  D(2).Arr(2) = 3.45678
End Sub

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I think it fits the brief of being jagged but I doubt the structure in memory will be the same, maybe worth a shot though.

Can a Jagged array hold multiple data types or just one? Is it possible to alter the dimensions of a jagged array once declared?