Hi Ryan,
You Can use the fusion Charts for adding the trendlines to the chart
https://www.fusioncharts.com/features/trendlines#trendlines-in-charts
and also it is easy to implement in mendix.
Thanks
Hi Attar, do you know of any other methods other than Fusion Charts? I would prefer a method not associated with any cost.
Hi Ryan,
You can use fusion charts for free of cost but you will be having the fusion charts watermark on your charts.