There is a utility called CoverWidgets for Samsung Galaxy Z Flip 5 that allows you to run any app’s widget on Samsung’s cover display. This is not possible out of box on Z Flip 5.
CoverWidgets allows you interact with the widgets as well, so it is possible to use WhatsApp directly from cover display.
The best part is you do not need to install TWRP or root the Z Flip 5 to use CoverWidgets. To install it, just download it from Play Store – for free. It does have in-app purchases that will give you even more features.
The developer is bent on churning out more features, further enhancing its functionality. If you own a Z Flip 5, go ahead and download it on to your device.
Developer has pointed it that CoverWidgets is still an experimental app and not all widgets are expected to run error-free. Most popular widgets have been tested by the developer and work flawlessly.
CoverWidgets is not affiliated with Samsung in any manner – something to keep in mind. But judging but the ratings and user feedback, it seems to be working flawlessly for the Samsung Galaxy Z Flip 5 users.