[Solved]-Editing Chart.js legend template-Chart.js

this is from github:

You could add a personalized callback to the tooltip labels, where you round the values e.g.

1 - tooltipItem.yLabel.toFixed(2) would return a value with 2 decimal places.

2.123.toFixed(2)
>> "2.12"
2.0001.toFixed(2)
>> "2.00"

2- Math.round(tooltipItem.yLabel * 100) / 100 would return a value rounded to the nearest 2nd decimal place.

Math.round(2.123 * 100) / 100
>> 2.12
Math.round(2.00001 * 100) / 100
>> 2

tooltips: {
callbacks: {
    label: function(tooltipItem, data) {
        var label = data.datasets[tooltipItem.datasetIndex].label || '';

        if (label) {
            label += ': ';
        }
        label += tooltipItem.yLabel.toFixed(2);
        return label;
    }
}

}