Downloading, not sync'ing Google Calendar into SS


I have a few people extensively using their Google calendar to keep track of activities: They just create a new calendar entry on their phone for new or unexpected events ("The 1 hour meeting actually lasted 3 hours", "car broke down and I spent 2 hours at garage", "I ended up having lunch with client X").

To eliminate the need to enter into SS data that are already in the Google Calendar, I would love to somehow be able to download these events directly into a SS. 

Sync'ing with Google Calendar just overlays the information. How difficult would it be to modify the Google calendar sync with a download option?

Is there a way, or a 3rd party app, to do just that: Download the Google calendar entries into a SS?