Yes. WiiM devices can work with Apple TV, but the supported connection methods and audio formats vary by model. 

Connection Method 1: AirPlay from Apple TV to WiiM

Compatible Devices: See List of WiiM Devices Supporting AirPlay 2.

Setup: Use AirPlay to stream audio directly from Apple TV to compatible WiiM devices.

Audio Format: Limited to 16-bit/44.1kHz stereo. Does not support Dolby Digital.

Connection Method 2: Use HDMI ARC or Optical via TV

Compatible Devices: WiiM Amp, WiiM Amp Pro, WiiM Amp Ultra, WiiM Ultra, WiiM Vibelink Amp

Setup: Connect your Apple TV to your TV. Then, connect your WiiM device to the TV using the HDMI ARC or Optical port. For details, see Use Your WiiM Device with Apple TV for Enhanced Audio: A Step-by-Step Guide.

Audio Format: See the the table below for details.