Google is working on bringing an onscreen QR code and barcode scanner to Circle to Search. We managed to activate it, so here's a demo of it.

Additionally, since the built-in QR scanner on Android 13 and above uses the ML Kit Barcode Scanning API, it's possible this functionality could also be extended to QR scanning in the camera app.

QR codes are still a thing, apparently. Google has added a QR code scanner to the Chrome browser on iOS.