Hi

 myNote = Part.IInsertNote(PartNo + " " + Description);
swCustProp = Part.Extension.get_CustomPropertyManager("");
string Scalevalue = "10";
status=swCustProp.Get4("SW-View Scale", false, out Scalevalue, out valout);
myNote.PropertyLinkedText = $"$PRPVIEW:\"SW-View Scale({Scalevalue})\"";

I try this code to get the Custom property of scale value in drawing view but it always returns null in the Scale