Hi @Tom Mitchell,
There is currently no OOTB no-code solutions in your scenario. You need to ask for help from 3rd party SharePoint tools or develop by yourself to integrate QR codes and SharePoint list.
Also, we sincerely recommend you go to SharePoint Feedback community to provide your feedback: SharePoint · Community (microsoft.com). This is the best platform to let related team hear from you and make the products and services better for you and others.
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