Exporting option in Xamarin.Forms Chart is more transparent with a specific format since having support to get its stream. Using that stream of chart, we can export to desired format like, pdf, excel, word etc. not only as image.
You may often want to export chart as image from backend without rendering into UI, please refer this demo sample.
Note: You can refer to our Xamarin Charts feature tour page for its groundbreaking feature representations. You can also explore our Xamarin.Forms Charts example to knows various chart types and how to easily configured with built-in support for creating stunning visual effects.