Is is possible for Salesforce Duplicate Management matching rules to compare across objects?
This article talks about cross-object duplicate rules:
https://focusonforce.com/configuration/native-duplicate-management-in-salesforce/
as does this Salesforce help page:
https://help.salesforce.com/articleView?id=duplicate_rules_overview.htm&type=5
This article shows how to make them:
https://www.simplysfdc.com/2016/11/salesforce-duplicate-management-on.html
but it doesn't match what I see in the Salesforce matching rules screens.
When setting up matching rule criteria, there appears to be no way to select anything other than a field from the current object.
Is this a feature that needs to be enabled somehow or that existed and was withdrawn?