Would have liked to add Calories but since none of the expressions are accurate to display the same calories as fitbit itself I did not add that into the published version.
Maybe if facer supports calories #TAG# in the future that shows fitbit/samsung health calories data then can be updated.
Facer is developed to work with different OS and ecosystems. Limiting the tag to fitbit and samsung is leaving out wearOS from other manufacturers. Calories can be approximately calculated using expressions, a quick search on here will show you how.