That's pretty much it. I need to access a Google Sheet from a Philips Smart TV with Android 10.
This is my first Android TV and I was unpleasantly surprised to discover that Android TV doesn't allow you to install Google Drive from Google store.
I tried to access to it through some file manager apps like X-plore but it didn't work.
Are you actually planning to use a spreadsheet app on TV? Or do you need it as a part of presentation? In case of the latter, integrate it into your presentation on Google Slides instead, open it in your phone, and cast.
If you really do want to use actually spreadsheet app on TV, just sideload it. And connect a mouse + keyboard, too.