That's a tricky thing you're asking for! We do it in the "multi-branched conditional" library, using a brilliant idea invented by the famous and brilliant nXIII, who's now an adult so you're allowed to know his name, which is Nathan Dinsmore.
You could probably get an Iphone or Android device and download the MIT App Inventor Emulator. Then you can open the app while pressing "Scan QR Code" on your computer, and then you can use the Iphone or Android device to scan the QR code.
Oh, it's easy enough to implement as a primitive. But doing it in user code requires input groups (namely, a group containing the title text ELSE IF, then a Boolean input, then a C-slot). Or else using Nathan's trick of putting the input group in a predicate helper procedure.