Request for Assistance with HomePod Mini

I use a pair of HomePod mini’s to play white noise while my child sleeps. I use two volume settings: a slightly higher volume while he naps and a lower volume during nighttime. We also use the HomePods to play music outside of sleep time, but when we adjust the music volume, we find we must continually readjust the white noise volume to the proper levels before naps or bedtime.

Is there a way to create a task using the Shortcuts app so that we can ask Siri to set the HomePod minis to a predetermined volume setting before naps and bedtime? (“Siri, set nap volume” or “Siri, set bedtime volume”) This would make things much simpler, as otherwise we must fiddle with the volume settings until we find the desired setting. Thank you!