I was seeking an answer to this question but I wasn't expecting having to manually put the value in the tooltip. In the example here (https://google-developers.appspot.com/chart/interactive/docs/customizing_tooltip_content#custom_html_content) for custom HTML content they seem to have created variables totalGold, totalSilver and totalBronze that allows the showing of the total within the tooltip but I don't understand how they are getting it to pass the value to those variables.
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