The recommended library for charts in Mendix is https://appstore.home.mendix.com/link/app/105695/ and and if that does not do the trick you can custom build chart JSON https://appstore.home.mendix.com/link/app/106517/
For extended documentation see: https://docs.mendix.com/refguide/chart-widgets#1-introduction
When using a lot of data, de REST data source might be an option for you, or use the any chart to generate the clean data.
This widget: https://appstore.home.mendix.com/link/app/139/ is a Highcharts wrapper for Mendix. However, it hasn’t been updated for 7 – might be a good starting point for you to work with though.
thanks for the the hint. But it seems that this widget requires persistent data objects, which I want to avoid.