Accepted answer

Please analyze this demo:

In the formatter callback, you can set wanted format to display as a dataLabel.

  dataLabels: {
    enabled: true,
    verticalAlign: 'bottom',
    overflow: 'none',
    crop: false,
    //y: 20,
    formatter() {

Also, I copied the logic from your previous question: how to determine the width of every column series present in the chart- highhcarts

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