For whatever it's worth, scanning the QR code for LR is not just a Hubitat thing, it's z-wave thing in general.
I believe there's a way to do it without scanning, but from what little I've heard, it sounds very tedious and futzy.
Jeff (jtp10181 from his post above) created a super handy SmartStart app for Hubitat that makes managing SmartStart pairings (LR or otherwise) easier -- this app isn't necessary to use, but it's a very nice convenience -- if interested, you can check it out here: