Creating pie chart with nested data

Hello. We have tabular data formatted like this: "CollectionName" "CollectionSize" "PercentageUsed" "FOO" "36" "50" "BAR" "14" "36" (The first row is the column headers, translated into field names.) We are trying to create a dashboard containing pie charts like this: For each CollectionName, create a pie chart labeled with "CollectionName" that contains the value of field "CollectionSize." Within that pie chart, we want a wedge for the "PercentageUsed" field. So if "PercentageUsed" field is "50" (%) of CollectionSize, it would split the pie chart in half. If it's "20" (%) of CollectionSize then the pie chart would have a wedge that is 20% of the chart's size. We'll eventually want to be able to click on that wedge to drill down, but we'll tackle that later. We'd like the dashboard to show a pie chart for each CollectionName. I think I'm close. I can get it to create a single pie chart for one CollectionName. index=foo sourcetype="foo-usage" CollectionName=FOO | stats count by CollectionSize,PercentageUsed | transpose That will show a single pie chart for the CollectionName "FOO." How do we get a pie chart for each CollectionName on the dashboard? Thanks!