Critical iOS notifications with the Alert platform? Is it possible?

Configuration
1

Hi all, has anyone out there made critical iOS notifications work with the Alert platform? I can get them working in an automation like so

            - service: notify.whole_family
              data:
                title: "!!Open Window and Rain!!"
                message: "Sophie's window is open and it's raining! Close it!"
                data:
                  push:
                    sound:
                      name: "Update.caf"
                      critical: 1
                      volume: 1.0

But when I try to recreate this in the Alert platform, it doesn’t seem to work. Has anyone cracked this nut yet or is it just not possible?