How can labels/legends be added for all chart types in chart. js (chartjs.org)?

problem ：

The documentation for chart.js mentions "legend templates" but gives no resources or examples of such legends.chart.js The document of refers to “ Legend template ”, But there are no resources or examples of such illustrations .How can these be displayed? How are these displayed ？

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Solution ：

Reference resources ： https://stackoom.com/en/question/1NaK8