This is good news as it further expands the capabilities of web apps. This addresses a longstanding request for web apps to deliver notifications. Note that web push only works if the web app is added to Home Screen. It is to limit web apps that aggressively ask for too many permissions.
With iOS and iPadOS 16.4 beta 1 comes support for Web Push for Home Screen web apps, Badging API, Manifest ID, and more.