Store your QR codes on your phone and send to Garmin watches, your data is NOT sent to the web. Use the Garmin App QRWallet https://apps.garmin.com/en-US/apps/2d55793b-4169-423b-961d-33de895f36fa to display your QR codes to your Garmin watch.

Encodes your information you'd like to share with others.
Examples
Personal or professional web pages https://my.site.com
Email address mailto:[email protected]
Personal or professional telephone number tel:+19995551235
Personal or professional contact information using 'vCard'
Wifi connection info - WIFI:T:WPA;S:myWifiName;P:myWifiPassword