There is. Open the app, play a song. Tap the little Speaker button in the bottom right, near the scrub bar, Airplay & Bluetooth, select your HomePod. :)
It's one of the many examples of Spotify complaining about Apple, then when they are given APIs they can't be bothered to implement them in their apps.
It's one of the many examples of Spotify complaining about Apple, then when they are given APIs they can't be bothered to implement them in their apps.