Vizlib Venn Diagram - Pure non intersect KPI

Add a KPI option to show the number of values that DID NOT intersect with other groups, like a second KPI in smaller font with label like "only in that group: ".

Use case: We want to see how many users did access one stream, but not others. Typical analysis for managing licenses and cross charging platform costs to the business.

We can do the math manually with every selection, but frankly speaking this could be part of the chart itself.