Protobuf classes not parsed for autocompletion

Seems like overdue or I am missing something but PyCharm (2021.1 with Py3.9) does not support autocompletion for protobuf classes (for the lack of a better term).

For example, using the code snippet at https://pypi.org/project/googlemaps, Pycharm shows a "Unresolved attribute reference 'geocode' for class 'Client'". Code works but I need either to consult the documentation online or look into the Class code to figure the right syntax or see what other attributes are available.