If you use the Reminders app Upgrading the Reminders app in iOS 13 or later.
You can use the Reminders app to manage your reminders from other accounts, such as Microsoft Exchange, Google, and Yahoo.
Go to Settings receive notifications, choose the alert style, and have Siri announce notifications.
Accounts: Manage your accounts and how often data is updated.
Default List: Choose the list for new reminders you create outside of a specific list, such as reminders you create using Siri.
Today Notification: Set a time to see notifications for all-day reminders that have been assigned a date without a time.
Show as Overdue: The scheduled date turns red for overdue all-day reminders.
Mute Notifications: Turn off notifications for assigned reminders.