This plugin itself as it is, does nothing. It is jsut provider for awesome chart.js library. It allows you to easily use js-rendered charts to the job page or to the view page.

See examples in known plugin consumers for:

• report-generic-chart-column-plugin
• report-diff-plugin
• jenkins-report-jck

This api is simply adding the chart.js library to the view and/or project page see header. You have to first require it in your pom:

        <dependency>
           <groupId>io.jenkins.plugins</groupId>
           <artifactId>chartjs-api</artifactId>
           <version>${chartjs.version}</version>
       </dependency>

And then, eg. in your column.jelly or floatingBox.jelly you can use powers of chart.js directly. See appropriate files in above projects for examples. See https://www.chartjs.org/docs/latest/ and you should be ok to script it in wihtout issues.