You can use your Samsung Watch 4 to track your workouts on Google Fit and then sync to Grokker.
https://support.grokker.com/hc/en-us/articles/360000423472-How-do-I-connect-my-Fitbit-Garmin-or-Google-Fit-account-with-Grokker
https://support.grokker.com/hc/en-us/articles/4629219530509-How-can-I-use-Google-Fit-to-track-my-workouts-on-my-smartwatch