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Sorry but your question is a bit vague to me. Would you mind elaborating it further?
If you mean, if the field with a default value has been hidden by condition, you want this to appear on email? Unfortunately, once a field is hidden by condition, it's considered as empty so any default values of that field will not be captured.
In that case, I would suggest using Hidden Box tool instead it's under Widgets then enter a default value. This will be displayed on the email notification.
If this is not what you mean, kindly provide more details so we can assist you better. Thanks!