This doesn't appear to be something that Siri can fix. I've personally tried modifying this via Siri and via Shortcuts, an neither would allow the change to propagate. Here is my theory....
First, the "wake alarm" appears in two distinct places: Alarms and Focus. Secondly, it is impossible to access Focus setting via an alternate method like Siri or Shortcuts. The only way I was able to gain access was manually through the App itself.
I can see how earlier versions of iOS allowed you to change Alarm date and settings, but things like "Wake/Sleep" get integrated with focus. I've been dealing with this issue since at least iOS15
Perhaps you can provide some additional details of what you'd specifically like to have edited?