This topic catch my eye, normally we scan a QR code is just want to capture the text encoded in it. In what situation we need the image of the QR code?
As Willow said, yes, you may have a two separate column, one is image, another one is text (scannable).
Or if you just want to save the encoded text in a image format, then you can try this. Similar, you required to have two cols, one is image (QR code generated from a barcode website), another one is text (with scannable barcode). In your app, when the text ISNOTBLANK, then AUTO COMPLETE or initial value the image column with a formula (generating QR Code from a barcode website)
If you wan to know how to generate QR code image from a web, you may refer to the video here: