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You need to have charts as separate entities:
// Put all the instances of Chart into a single array
let charts = [chart1, chart2, ... ]
// when the data comes back, do the following:
let data = [80, 70, ... ] // example data
data.map((value, index) => {
let chart = charts[index];
// assign data to chart
chart.data = value;
})
Source:stackexchange.com