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I don't think you can opt out from a specific notification, but you can opt out. If you do you won't get any emergency broadcast notifications, at least that's how I think it works.
Not true for all devices. Samsung at least I can disable amber alerts while keeping emergency alerts on. Which I did after being woken up at 3am telling me to be on the lookout for a white SUV, as if I could see that from my bed.
Yeah iPhone as well can independently enable Amber, Emergency, and Public Safety Announcements.
I don't want to opt out, I just want "let us know if you see a grey Buick" to not use the same alert sound as "nuclear attack incoming".
How many alerts have you gotten for a nuclear attack!?
Well zero, but only because I don't live in Hawaii
https://en.wikipedia.org/wiki/2018_Hawaii_false_missile_alert
Pixel 8 Pro here I can specifically opt out by alert.