Hi Stephan,
Thank you for using Syncfusion product.
We can highlight every drawn point in the series by displaying data on the chart points.
We have to implement IChartSeriesModel interface, we can set it as the data underlying any ChartSeries object using the SeriesModelImpl property. Use this property to replace this instance with your own implementation. In this sample SeriesModelImpl property is used to display the data.
Please look into the sample and let me know if its helpful.
http://websamples.syncfusion.com/samples/Chart.Web/6.1.0.34/70333/main.htmIf I have misunderstood your requirement, could you please explain me in detail, so that I can work in depth and try to send a better solution.
Regards,
Suba