Hi Hendryk,
Thank you for contacting Syncfusion Support,
Currently we don’t have support for “Widget annotation in the PDF Viewer control” in Xamarin Forms. We have already logged the feature request.
We don’t have any immediate plans to implement this feature. We will implement this feature in any of our upcoming releases. We usually have an interval of at least three months between releases. The feature implementation would also greatly depend on the factors such as product design, code compatibility and complexity. We will update you once the feature has been implemented.
Regards,
Karthik.