I created an extension that I called DeepLink that allows you to open other apps via clicking on a link in a webviewer.
It’s still kinda in the Beta stage but I added a wa.me link to the project for testing.
It does open the WhatsApp app but it also opens WhatsApp in the WebViewer.
Check it out and let me know if this will work for your needs:
DeepLink.aia (10.6 KB)