This was news to me, and welcome news at that. My wife and I listen to rain sounds through the HomePod every night. Now I can add that step to a ‘goodnight’ scene that also takes care of turning off lights and setting the sleeping thermostat temp.

HomePod software update notes highlighting that “Remastered ambient sounds are more immersive and can now be added to scenes, automations, and alarms in the Home app”