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In dataPoints, the x value can either be numeric or DateTime object. If you want to show a string as the X-axis label, you can use the label property.

Kindly take a look at this code-snippet for an example,

data: [{
  type: "column",
  dataPoints: [
      { label: "One", y: 71 },
      { label: "Two", y: 55 },
      { label: "Three", y: 50 },
      { label: "Four", y: 65 },

Also, take a look at this JSFiddle for an example on column chart with labels.

column chart with labels