This is a really specific question for those who have built chrome extensions using the Google Sheets API.
I've tried searching on stackoverflow but they all seem to be doing something different than what I'm asking, which is how to set up Google Sheets API in a chrome extension. I want my chrome extension in the contentScript.js to inject cell text as html an external Google Sheet similar to this this tutorial. The spreadsheet is here
I can't find any posts or documentation on how to set up the API in a chrome extension. I see in the tutorial that it loads <script async defer src="https://apis.google.com/js/api.js"
in the inline script. Is this the API that lets you use the .gapi? Not sure how to incorporate this in the manifest so I can start using the Google Sheets API in my contentScript.js