searchableAttribute with wildcards?

My index has objects with child objects. Some of these child objects have keys that are ids that aren’t known ahead of time. For example: parent.child.unknown_id.text

I want to specify the above as a searchableAttribute but need wildcard syntax support for the unknown_id part of the attribute. I’ve tried parent.child.*.text but that doesn’t work. Does support exist for this case?

Thank you for your help.