I think your bigger problem is that the watch appears to be on fire while you're asleep.
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It's OK because I am extremely handsome, and I have double jointed fingers
There could be a shortcut to activate an alarm based on this. But I’ve never used shortcuts with Apple Watch to know definitively.
This site has some shortcuts people have created and shared for use https://routinehub.co/
There are no health triggers for shortcuts.
Probably too much liability if something doesn’t work out as expected.
I have so many questions lol
This picture is redonk
Is the phone saying sleep apnea in mixed language?
You might be able to create a very convoluted way by scheduling a Shortcut every few minutes that pulls the latest SpO2 records from Health and if they’re too low, creates an alarm in a minute to wake you up.
But be aware that sleeping on your arm with the watch will also make the readings drop. Also, the Apple Watch only takes a measure every 30 minutes. So it’s probably difficult to catch an apnoea event.