An idea I had when I first read this is to create a custom tooltip for that 
slice of the pie chart to explain or display the information, even another 
pie chart, for that slice - 
https://developers.google.com/chart/interactive/docs/customizing_tooltip_content

According to Stackoverflow, if you only want that particular slice to show 
the custom tooltip set all the tooltip information for the other slices to 
null or "" and they will show the default tooltips. If you don't want them 
to show any tooltips at all, then you can hide them with CSS - 
https://stackoverflow.com/questions/39977947/removing-tooltip-for-one-part-of-piechart-google-charts

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