We can develop custom chart widgets from Highcharts samples.
(Please note OutSystems Platform only offers the license of the Highcharts version it includes. As of now, the Highcharts 6.1.4 should be included in OSP.)
You can refer to the Highcharts samples in the following document (index.htm).
https://code.highcharts.com/zips/Highcharts-6.1.4.zip
Then you can copy and paste JS source code from the Web Browser, and create your own chart widget. This sample shows how to do it.
A movie link which explains this sample. (Sorry, it is in Japanese only...)
https://youtu.be/Ya7mZ1YENks
Added a sample to show "Solid Gauge".