I recently published this module for web push, works on desktop without a mobile app.
Check ti out https://marketplace.mendix.com/link/component/114331
Widgets Team – Mendix
I don't think there is an ‘out of the box’ solution for this in the appstore. There are however some third parties who offer this like for example one signal :https://onesignal.com/webpush
This will let you do webpush from Mendix through REST