It would be great to have a field question for email specifics, as it would be beneficial to send the survey results to the inputted email.
You can likely do that with Power Automate. I know you can with default email addresses, not as sure about one coming from the survey itself.
Automate email notifications with survey reports from ArcGIS Survey123 using Microsoft Power Automate from Esri support
https://support.esri.com/en-us/knowledge-base/how-to-automate-email-notifications-with-survey-reports-000034101
I set up an email notification using make.com and a gmail account. Example setup.
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