Any reason you are not using the built-in chart?
PS, to integrate with external dependencies (like chart.js), there is a specific pattern required. Template ui-template | Node-RED Dashboard 2.0
Also, on that page (scroll to the top) is a "Try Demo" button that has an example of loading eCharts and populating them with data - you could copy/download that demo flow and adapt it for chartjs
Also, there is this demo: How to configure Echarts in Dashboard 2? - #4 by Steve-Mcl
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