Play music on HomePod via managed Apple Watch

Hi. If a kid has an Apple Watch that is managed as a family watch (ie, kid doesn’t have their own phone, watch is managed from a parent’s), is there a way for the kid to play music over a HomePod from the watch?

It’s possible to pair the watch with (non-Apple) Bluetooth headphones. However, when I go to Now Playing on the Watch, tap the Airplay symbol, tap Connect a Device, no HomePods show up.

For that matter, no HomePods show up on my own watch. Is this just not possible?

It’s possible. I can do it in Apple Music from my watch (AW 9, latest watchOS.)