You can apply a precision count to all numeric values on the chart using the decimals attribute in the globals object.

globals:{
  decimals:1
}...

If you want to apply decimal precision to only a specific portion of the chart you would apply the decimals attribute to the object you want to modify. Lets use valueBox.

plot:{
  valueBox:{
    decimals:1
  }...
}...

To see the difference between the two examples, hover over then nodes and look at the value above the bar.

Relative Documentation

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