Can you clarify or give an example? I don't quite follow what you're asking. I think what you want to do is setup a new Global rule in Herald for Ponder. You can configure the rule such that:

• Condition: Projects include #feature
• Action: Add subscribers #team_responsible_for_feature

That's exactly what I needed.
I thought I could create one global rule to do this. But if I get this right, I have to create multiple rules for every single project to add as subscriber :D