You can use loop on each point, and remove stackLabel's SVG object.


If that is enough to pick the middle column, and show a zero above, then something like this would do the trick:

Of course if you have even number of columns, the zero won't be centered. That case I think the best you can do is to find where to put the zero, based on the column heights and draw it directly with Highcharts.Renderer().

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