[Chartjs]-How to show decimals with 0 in chartJS

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You will need to format your tooltips value as a string, this can be achieved by adding a label formatter using .toFixed() (Documentation) into the options:

plugins: {
  tooltip: {
    callbacks: {
      label: function(context) {
        // This guarantees that 1 decimal place is shown
        return context.parsed.y.toFixed(1);
      }
    }
  }
}

Forked version of your codesandbox showing this in action.

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