An Apple Watch owner has created a complication and watchOS app that works with a glucose monitor, so they can keep track of their blood glucose level from their wrist. : gadgets

you could use a dexcom with the mobile app- I have had my blood sugar on my Apple Watch since I got the dexcom g6.

The libre is an inferior product that does not have a continuous connection/ so this is an improvement for one manufacturers device that is pretty huge. Sometimes insurance company only allows the crappy hardware so I am glad there are people out there doing stuff like this.

Previously you would have to bring your phone to it to get a reading