'OpenXML- Multi-level label for Category Axis

I am trying to include Multi-level (two levels) labels for Category Axis while generating chart with OpenXML. The top level label should be right aligned and bottom labels should be centrally aligned.

I tried using "NoMultiLevelLabels" with the value "false" to be added in "CategoryAxis" instance.

I also tried using multiple "CategoryAxisData" series to be associated with "CategoryAxis" but nothing works. I can see only one level of labels.

A small example will definitely a welcome relief. I am using C# and OpenXML sdk.



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