While we do not have a direct connection with Garmin, you can connect Withings App with Garmin via a third-party app (such as Apple Health or MyFitnessPal). Here's how:

Note: Make sure that Apple Health is connected to Withings App first.

1. Go to Apple Health.
2. Go to the Sharing tab.
3. In Apps, tap Garmin Connect.
4. Tap Turn on all.
5. Now, the data collected by Garmin Connect will be available in Withings App via Apple Health data.