SearchKit: no JOIN available for ContactReference custom fields
I have a ContactReference custom field and an EntityRef field defined in XML schema on an entity. [Update: both are storing a single contact id] In SK I'd like to add a join to the Contact entity via the custom field. There is one available for the EntityRef field, but not ContactReference custom field. I can make the join in API4 just fine.
This looks like a missing piece of functionality. Or I'm just not looking in the right place.