[Plugin: Relevanssi – A Better Search] [Plugin: Relevanssi] Add extra database fields to search?

Is there a way to get Relevanssi to search extra fields in the WordPress database? I’m using an event management plugin that stores its info in extra database fields (with a consistent prefix). They’re not using custom post types; perhaps I should add the field index in your “custom taxonomies to index”? If so, would it take something in the form of wp-em* or would I need to list each field separately?

https://www.ads-software.com/extend/plugins/relevanssi/