There is not an Automatic property for the Keynote value. Perhaps someone more familiar with the details of the AutoCAD Architecture object model than I am could figure out a Formula property that would retrieve that information.
Unless you have a large number of styles/definitions to which this would have to be added - or if this is something that changes frequently in your workflow, I would be tempted to create a style-based Property Set and add a Manual text property and manually type in the Keynote value. I realize that will not update automatically if the Keynote value is changed.
David Koch
AutoCAD Architecture and Revit User
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