I have exactly the same problem and the same question. I watch a tutorial on youtube: How to use Google Sheets in Home Assistant - TUTORIAL - YouTube and I see that config_entry should be added automatically by the integration for us. My assumption is that I did not configured correctly the integration or the integration is broken now. Can someone please clarify?
Dear @cosmin thanks for the reply.
In File Editor there is no “.storage” folder.
(i confirm that. Maybe it has something to do with config_entries, because when i click the button “call service”, it returns an error saying “…required key not provided @ data[‘config_entry’]”
I am not familiar with File Editor. File managers also hide things starting with “.”. Make sure you enable seeing hidden files/folders with your file manager, if needed.