Hello, I believe the functionality you desire can be configured by using the drill down feature.  

First configure your top level report definition.  Include one summary column.  Configure a chart on the chart tab.  By default, when a chart is displayed the supporting summary data for the chart is in a table below.  

If you want to display different supporting data for each value, on the report viewer tab you will see a field to enter a "custom drilldown report".  The default report will display the data you want to see.  You can customize that report to also be a summary report with a chart.  This allows the user to drill down into the data and then back up to the top level.  

Additional articles you might find useful:

Overview of chart features
https://docs-previous.pega.com/working-charts-reports-pega-7

Tutorial videos
https://pdn.pega.com/reporting/reporting-in-prpc-tutorial-videos#pega7

Regards,

Tara

Pega Academy Support Team