You can download the spreadsheet, but can’t grade in it. I’ve made a bunch of Python scripts to export a spreadsheet and reimport with grades at my institution, but I cannot guarantee they will work for others! It only works with Classic Quizzes, not New Quizzes.
The scripts export a .csv spreadsheet, which can then be reimported with grades and comments. For safety, grades of 0 are not imported and must be manually entered.
It’s a pain to use and still in a kind of alpha version, but if you are interested I can try to help you set it up.
