How can i set true false value for checkbox field if user didn’t filled i want show in notifications as false

How can i set true false value for checkbox field if user didn’t filled i want show in notifications as false

If i have three value in check box and i added three fields on email notifications set but now issue is if user fill one value and empty other two checkboxe then in email notifications it’s show blank so i want to show false instead of blank.

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