How do I hook up an Apple TV 4K to my PS Audio Sprout for Loseless Audio

My current Apple TV has Optical out but I'd like to upgrade to a 4K & Lossless Audio. How do I hook an Apple TV 4K directly up to my PS Audio Sprout for Lossless Audio listening? It looks like the Apple TV 4K does not support High-Res Lossless, maybe due to removing the Optical out?

https://www.psaudio.com/products/sprout100-integrated-amplifier/