For the relevant point in your data use the object notation and enabled data labels. You can use format and formatter to display the desired information.

您的系列示例如下：

series: [{
    name: 'My series name',
    data: [5, 10, 30, 100, 200, 300, 600,
        { 
            y: 900, 
            dataLabels: {
               enabled: true,
               format: '{series.name}'
            }
        },
        700, 400, 100]
}]

或参阅这个更详细的JSFiddle示例。