Adding comments on the line chart datapoints in chartjs

I want to add some comments for every data points in a line chart on click event. Currently, when I hover over the points I can see the x-axis and y-axis values associated with the datapoint. Along with that I need to add some comments on click event. This click event doesn't seem to work

 hover: {
     onClick: function(evt) {
     var el = myChart.getElementAtEvent(evt);
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