Hi Muhammad,
Currently, document editors doesn’t provide support for watermarks.
We have already logged this as a feature request. We don’t have any immediate plans to implement this feature now.
We usually have an interval of at least three months between the releases. At the planning stage for every release cycle, we review all open features once again and finalize features for implementation based on specific parameters, including product vision, technological feasibility, and customer interest. We will let you know when this feature is implemented.
You can track the status of the feature using the below link:
https://www.syncfusion.com/feedback/16235/support-for-watermarks-in-document-editor
Regards,
Balamurugan S