Extensions: where to store credentials json

Hello Cognigy,

I'm on my way to creating an extension for appending Data to Google Sheets.
Authentication is only possible via OAuth2. So far so good, but what's the best way to store .json file I've got from google with all the credentials?
Adding it directly to the extension - probably not the best idea, even if the extension will be local to our organization.
I definitely want to share the extension as soon as it will become polished.

Two important fields I need from this file:
- E-Mail
- Private Key (in the form of "-----BEGIN PRIVATE KEY-----\nMIIE..").

Should I use Connections feature, if so, then how?

Thank you!

Best,

Anton