Hey Ben,
Thanks for getting in touch and welcome to the forums! I hope you’ve been enjoying Event Tickets and Event Ticket Plus so far. 🙂
I’m afraid that getting the additional attendee meta info included in the notification email isn’t a feature right out of the box and would require custom development to make it happen. While I don’t have a workaround available, “tickets” are really just a post type within WordPress so all of the meta-related functions like get_post_meta()can be used for custom coding “Custom fields” functionality using this as a reference:
https://developer.wordpress.org/reference/functions/get_post_meta/
Sorry I don’t have a concrete solution for you here, I hope this information is helpful. Let me know if you have any follow-up questions and I’d be happy to help as best I can.
Cheers,
Geoff