score:1

Increase chart.marginLeft and enable reserveSpace or align labels by x property:

labels: {
  ...,
  reserveSpace: true
}

Live demo: http://jsfiddle.net/BlackLabel/71gxj4sd/

API Reference:

https://api.highcharts.com/highcharts/yAxis.labels.reserveSpace

https://api.highcharts.com/highcharts/yAxis.labels.x


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