This works pretty well just not as nice if TE was a Zwift feature, but, hey, Zwift is a lot of fun.
I am using a NEO 2 with Zwift running on an iPad. My bike computer is a Garmin Edge 1030. What works is to set the Garmin indoor cycling to only pair to NEO Power and your Heart Rate monitor. The Garmin will then track time, heart rate, power and strangely cadence. I find it best to pause both Garmin and Zwift. Save Zwift first until it goes to Strava or whatever, then save the Garmin.
Garmin Connect will post this data to Strava as well. If you want just delete it from Strava or Edit it to note what it is. I have done 3 rides using this method. It took two to fix operator errors. I’m not sure which Garmin devices do Training Effect.