Any way to have one Escalation Chain send emails to different people for different resources?

What you're doing sounds like what I'm doing with the Group_ID.  What I'm really asking about is the Email portion.  If I sometimes want to email John and sometimes Frank or Rob or Bill, I think I need to create them each their own Escalation Chain.  What I want to do is one one Escalation Chain that can pull from a Property that contains the email address to use.

I currently have about 30 different escalation chains that just send email because I have a separate one for every department and/or person that needs to get emailed about something.  That's messy.