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this is possible by adding the property pointRadius
in your dataset object and give it an array for the radius of each point
Working example (with text on the Y axes as seems you want, to get the desired result each line will need to be a different dataset): https://jsfiddle.net/Leelenaleee/2gtndc3h/1/
dataset example:
{
label: '# of Votes',
data: ['', 'Request Added', 'Request Added', 'Request Added', 'Request Viewed', 'Request Viewed', 'Request Viewed'],
borderWidth: 1,
lineTension: 0,
pointRadius: [2, 4, 6, 18, 0, 12, 20],
}