I haven’t checked, but this seems like something that could probably be handled with Automations. Wix’s automation features have developed quite a lot recently, so for common use cases like this, there’s a good chance it’s already supported. If it turns out that Automations can’t cover it, you could attach a data hook to the collection where the form submissions are stored, detect when a new form is submitted, and then send a confirmation email with the form details via code at that timing.
This article purports to show a workaround that will allow you to send content collected on the form within the automated email, but I’m not sure I understand how it works. See ‘personalized content’ in the FAQ section. Let us know if it works for you.