Get name of variable that holds instance of a class

See my code. It is working, it writes to debug InstanceName of a Class2 instance (the name is Test). I want to change my code so that in Class Form1 instead of line Test = New Class2(NameOf(Test)) there will be line Test = New Class2(). And assigning the InstanceName will be made automatically in the Sub New in the Class2. So that the Sub New would look something like this:

Sub New()
    Me.InstanceName = **???Me.GetParent.Name???**
End Sub

Now this is the working example:

Public Class Form1
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Dim Test As Class2
        Test = New Class2(NameOf(Test))
        Debug.WriteLine($"InstanceName: {Test.InstanceName}")
    End Sub
End Class

Public Class Class2
    Public Property InstanceName
    Sub New(InstanceName_ As String)
        Me.InstanceName = InstanceName_
    End Sub
End Class