Unfortunately, there is not a method to achieve this within Knack. Sitemap crawlers online won’t work either. If you use Chrome you can have the Admin visit each link in the app and click the QR code option in the browser address bar to generate a code.
It would be quite simple with Integromat- have it read all the records with no QR code, then append the record Id to the page url and create a QR code with the barcode module and save it back to Knack as an image.
I thought I’d spend some time today to walk through the Integromat process. It can be adapted for many different types of applications. Creating a QR Code - YouTube
If you’re new to the world of Integromat, check out my getting started video too. This goes into more detail in regards to setting up the API connection to Knack: Getting Started with Integromat - YouTube
Using Integromat increases the awesome power of Knack
I hope this helps with your query and simplifies the complex.