Not really, it would require making changes to the code to achieve this (or creating derived classes). I can show you where in the code if you are interested (since you are source-code customers)?
Take a look at StackedColumnSeriesDrawingProvider.DrawColumnsNew (scichart wpf v6).
There’s some code in there which draws the columns and the text labels using the RenderContext.DrawText function. You could modify this here to inject some extra text. StackedColumnSeriesDrawingProvider.DrawColumnsNew has access to metadata.
Let me know if this helps
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