Google Authenticator API Key json format/layout/requirements

I tried using the new authenticator for Google. I’ve been using the login feature, but I have to manually intervene daily.

I switched to API – it asks for the .json file location. I saved a .txt as .json:

But I’m getting this error:

Execute failed: Error reading credentials from stream, ‘type’ value ‘apiKey’ not recognized. Expecting ‘service_account’

The help documentation in the node isn’t clear on how to properly format, does anyone have experience with using the Google Authenticator and know where to locate the script format (what is required, layout, etc.) for the api key?