How to combine 2 specific Hey Siri commands into 1

I would like to set up an automation (I assume this would be done with Shortcuts) to work with my HomePod mini in my bedroom, that I could command with Siri by saying something like: “Hey Siri, bedtime”.

Every night I say “Hey Siri, turn off the bedroom light”, which works via HomeKit.

I then say, “Hey Siri, play ocean sound”. This plays the Apple native ambient sound called “ocean”.

I can’t seem to locate this particular sound to refer to in Shortcuts. I’ve seen another post, (How to refer to Apple ambient sounds - Apple Community) which suggests other sounds found in Apple Music put into a playlist, but that’s not what I’m looking for, and that post is closed for comments now, but is directly relevant.

Wonder if anyone knows if this is possible as explained or using some other method? Saw someone suggest something kind of similar in HomeKit scenes? TIA