score:1
formatter = { headerformat = "<b>{series.name} </b> <br>", pointformat = "<b>{point.y:,.0f}%</b>" }
you need to add properties that are needed inside your formatter. headerformat is use mostly for the title of your widget(eg. drug name, city etc.) pointformat this will be the return string/number upon hovering specific widget. please see the sample here.
Source: stackoverflow.com
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