Currently Connect only can write data to Android / Google Health Connect. Is there any read support planed? Like for weight (when using a smartscale) or Nutrition data (when using another app)?
You can still sync weight from many brands of smart scales to Garmin Connect through a free account of MyFitnessPal. I do not know whether MyFitnessPal can import nutrition data from Health Connect, but it can read weight from many scales.