I have the same problem. This new Charge Stats section of the app is a wonderful concept to measure usage -- the first I've seen in 9+ years of Model S ownership. But, like you, my app, inflexibly and precisely, classifies my Work charging as Other.
Another wrinkle for me is that the app doesn't recognize the Work location (actually a summer home) I've had for many years -- but the Nav system handles it flawlessly. In addition, the default setting for Work usage assumes Illinois utility rates, while my Work address is actually 180 miles away, in Indiana.
It strikes me that the simple fix would be for a smart tech in Fremont to flip a switch and re-assign all of my 220v Other charging at that Indiana source to Work..
Maybe this is simply a handshake problem between Apple and Google mapping, but I'd be happy to become part of the solution, for both of us.