Hey Jessie,
Thanks for reaching out to us!
Unfortunately there isn’t a straightforward way to accomplish this with the built in search features. The additional field values that you’re able to set within the Pro plugin get saved as regular custom meta. So, you could potentially use something like the SearchWP to search for the additional fields. You would possibly need to replace the search field on the template for the SearchWP search form if that is required by that plugin.
I’m sorry I wasn’t able to give you a more direct response but hopefully this can help to get you pointed in a good direction.
Thanks!