score:2

Accepted answer
stackLabels: {
    enabled: true,
    style: {
        fontWeight: 'bold',
        color: (Highcharts.theme && Highcharts.theme.textColor) || 'gray'
    },
    formatter: function() {
        return  Highcharts.numberFormat(this.total, 2, ',');
    }
}

Demo

score:2

Looks like I needed yAxis.stackLabels.formatter which I didn't find until just now ;)


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