Digital Wellbeing officially coming to all Android One smartphones
Anyway, Digital Wellbeing was announced as a Pixel-exclusive app with the promise that Android One phones will eventually get it as well. As a matter of fact, Nokia 7 Plus, an Android One smartphone got support for Digital Wellbeing about a month ago.
Today, the app has been updated in the Google Play Store and received support for all Android One phones. Of course, Android Pie is still required, so that still limits availability a bit.
Unfortunately, the only devices that seem to qualify for the app are the Nokia 7 Plus and Nokia 6.1 Plus since these are the only Android One phones running Android Pie. If you meet these requirements, you can go ahead and download the Digital Wellbeing app from Google Play Store.