This forum is for software developers using the FIT SDK so you probably will not get a response from the community members. Or at least not a response that is on topic for the forum.
You can use the RunGap app to sync your Apple steps back to Garmin, BUT you can only do it on days where there are no steps already recorded by your Garmin device. So you can't do 'half & half' days recording some steps on Garmin and some on your Apple Watch. But if you only use your Apple Watch that day, then RunGap will sync your steps across to Garmin
Beware though – once you start sending data from Apple Health across to other apps, that data can then bounce back into the Apple Health app as duplicate entries. Garmin already sends duplicate workout entries to Apple Health and the Garmin team haven't found a successful fix in several years.
