Hi MarcoProblem99
Not sure if you were able to resolve your issue, but I too did not want to be waken up by my watch, tend to turn off the alarm and fall back asleep and then oversleeping. I want the alarm on my phone to wake me up, I put my phone somewhere that makes me get up and shut off the phone.
This is what I found, going to try this tonight and hope it works.
On your iPhone, in the Watch app, go to: My Watch (tab) > Clock > turn off Push Alerts from iPhone. To stop alerts for alarms from your iPhone from being delivered on your Apple Watch: On your iPhone, in the Watch app, go to: My Watch (tab) > Clock > turn off Push Alerts from iPhone.