When using the service google.add_event there’s no way to add a location to the created event as you can see in the docs here. Location is a pretty key field since apps use it to drive other parts of its user experience. For instance, when I get notifications for calendar events with a location then it includes shortcut actions to start navigation. And when looking at events with a location in many calendar apps i usually see shortcut links for navigation, street view images of the place I’m going, a place name, etc.
I would really like an option to set a location on the events created with this service. There’s actually a good number of other inputs in the REST API that aren’t exposed in the service options like attendees, color, visibility, reminder options, etc. I could see some others being useful situationally but location is the only one missing I really need.