Apple TV mirror TO iMac
This is a question on how to airplay Apple TV 4K TO an iMac or how to airplay music TO an iMac from appletv. Is that even possible since I see no way to do it. Everything is on the same WiFi network.
Apple TV 4K, tvOS 15
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You can’t AirPlay video from the Apple TV box to another device.
You can AirPlay audio from Apple TV to modern AirPlay receiving-enabled Macs*. Enable as speaker selection through Control Center on Apple TV.
AirPlay system requirements - Apple Support
Use tvOS Control Center on Apple TV - Apple Support
Set up your Mac to be an AirPlay receiver - Apple Support
* Requires macOS Monterey for these Macs: iMac Pro, MacBook Pro 2018 or later, MacBook Air 2018 or later, iMac 2019 or later, Mac mini 2020 or later, Mac Pro 2019 (Same Macs as for Continuity).