score:6

To get title in function

chart.options.yAxis[0].title.text

Or set title like this:

 yAxis: {
        title: {
            enabled: true,
            text: 'Custom with <b>simple</b> <i>markup</i>',
            style: {
                fontWeight: 'normal'
            }
        }
    },

DEMO

score:9

Correct way to get Y Axis title in tooltip formatter is :

this.point.series.yAxis.axisTitle.textStr

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