There is an option. You can login and sync LFconnect with Google Fit then use an app on Android called Health Sync. https://play.google.com/store/apps/details?id=nl.appyhapps.healthsync&hl=en_AU&gl=US
This will sync the Google Fit data back to Garmin Connect.
I have been using it for years to sync my Garmin Connect with Google Fit. It is limited to a single direction at a time. I'm considering just dropping Google Fit and just use Garmin Connect so I will be looking at reversing the direction now that I have joined a gym with LFconnect devices.