Hi @Joe_Petrilli welcome to Zwift forums.
Yes, that will work as long as the two of you are not riding at the same time. Because you’ll have to switch accounts and log in with email & password, you’ll face some hassles for logging in with the ATV remote that single-account users do not deal with.
AppleTV has some limitations that MacOS does not. ATV can only support 3 concurrent Bluetooth devices, including the Apple TV remote. That leaves only two open slots to connect the trainer as a control device / cadence / speed, and you will not have an open slot to connect your heart rate monitor.
When you have more than one person using the same Apple TV the ATV remote makes it awkward to enter a username / password, and you’ll wish you had a keyboard instead. If you have an iPhone or iPad, you can install the AppleTV keyboad app, and this will make login easier.
This is my opinion, but if your Macbook runs the game well, I’d stick with that and connect it to a decent-sized affordable monitor mounted to a stand.