Best way to get audiobooks to play on HomePod?

I am fairly heavily into the Apple ecosystem, but I have the Amazon line of smart speakers and I like listening to audiobooks. I have a few Apple audiobooks but the HomePod doesn’t natively want to play them. It also didn’t want to handoff the audiobook like it can do with music and podcasts.

So what would be the best way to get my HomePod to actually play the audio I want it to?

Poking at the settings I wasn’t able to find a way to Bluetooth pair my iPhone with the speaker either.

Is it possible to use my Mac to stream audio to my HomePod in a way a lazy google search didn’t reveal?

Thanks for the help.