0👍
✅
I ended up figuring out the answer to this problem.
for (i = 0; i < chart.data.datasets.length; i++) {
if ((chart.data.datasets[i].label == 'Last Place') || (chart.data.datasets[i].label == 'First Place')) {
chart.data.datasets[i].borderDash = [1, 3];
}
}
chart.update();
Source:stackexchange.com