Fenix 6X Pro+Apple Watch Series 5

I am a proud owner of the F6X Pro Sapphire (exchanging it for the solar version soon) and of the cellular AW5.

What is the best way to sync data between the two? I have used Rungap in the past but am keen on a more automated way of the AW (as my daily driver) to report steps/distance/calories onto Garmin Connect.

That would help with GC being up-to-date at all times. Naturally, I intend to use the Garmin for working out/races/hiking etc; 

The cellular capability of the AW will be great for training runs without my phone thanks to the great Stryd app.