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Unfortunately we have no provision for sending expiry notification for forms at the present.
I have submitted your inquiry as a feature request to our development team, we will update you on this thread regarding its progress
In addition to what my colleague Sammy has already said, please note that, as a workaround, you can make your form unavailable after a certain expiration date.
You can set it up by going to Setup & Embed > Preferences > Form Limits, and setting the Expiration Date of your form.
You can read this guide for more details about setting up form limits: How-to-Limit-Submissions-in-a-Form
It will not send a notification when the expiration date is near, but it will prevent users from submitting the form any further once the set date has passed. Hope this helps.