Yes what you could do is create a string deeplink url.
You could for example add a parameter in that as well for some data.

Then create a qr code of this string url using this widget: https://marketplace.mendix.com/index3.html

When you then read the QR code with this widget: https://docs.mendix.com/appstore/widgets/barcode-scanner/ 

The deeplink will get triggered and you can add the microflow logic in that deep link