Hey Hugh!
There’s not a method inside the plugins at this time to build these sorts of custom fields; in other words, nothing in the options panel you could use to build these custom fields (on tickets, anyways – Events Calendar Pro does have this feature but just for events specifically, and not tickets).
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So you could build custom fields but at this time it would unfortunately require custom coding. While we are not able to help with custom code here, “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 → https://developer.wordpress.org/reference/functions/get_post_meta/
I hope this information is helpful; let me know!
— George