4👍
✅
This works for me (you probably just need to add update):
function addData() {
myBarChart.data.labels[12] ="2017";
myBarChart.data.labels[13] ="2018";
myBarChart.data.datasets[0].data[12] = 500;
myBarChart.data.datasets[0].data[13] = 600;
myBarChart.update();
}
CodePen: Add/Remove adjust data Chart.js
Source:stackexchange.com