Currently, the Critical Alerts notification options is only available for iOS and this feature isn't enabled in Android.

This is required to add granularity to the alert notifications in Android.

Workaround

On the phone, change Jira app's notification settings to override Do Not Disturb for the notifications that you need DnD overridden for. This also gets around the Android limitation of apps not being able to see DnD schedules on the phone. With the Opsgenie app, the phone would go back into full DnD mode if scheduled DnD was overridden.