One can set individual settings for each datapoint in the datasource of the chart. The available properties are x, which determines the x value along axisX; y, which determines the y value for the point; as well as any additional settings applicable for a point of this type - bar/line/area, etc:

dataSeries: [{
    data: [
        123.4, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 
            pointName: "Special point",
            x: 17,
            y: 216.4,
            borderColor: "red",
            borderWidth: 3,
            color: "pink",
            selected: true
        148.5, 216.4, 194.1, 95.6, 54.4]

The code above applies these settings to a point of type bar. The styling settings are different for different series types. For more information, please refer to the seriesSettings object.

NOTE: The selected property is applicable for all chart types except rangearea and rangesplinearea charts.

This setting is demonstrated in the following example.