homepod mini/mac computer?

You’re welcome.

if you have MacOS Big Sur installed there are additional features. You can AirPlay to your mini from other websites that don’t have the AirPlay icon in the media player. Use the Control Center - choose your mini from the icon I circled in Sound

Use Control Center on Mac - Apple Support

You can AirPlay to a mini from your Mac. They need to be on the same wifi network