But on other versions, it depends on the 3rd party app you use for QR code scanning. From the screenshots, it seems like certain versions of Android have this available directly from the Wi-Fi password screen, without the need for a 3rd party application.
Are you deliberately trying to be confusing? A "bundled camera" is the exact opposite of a 3rd party app. 3rd party would mean one must install it from the playstore.