Can I create rule on AWS ELB so as to transfer all mobile traffic to another EC2/server

We do not have mobile app right now. We host mobile website on different EC2 instances. As of now I ELB which redirects traffic to nginx. We have logic on my nginx to identify mobile traffic and redirect to appropriate EC2 instance.

Is it possible to put a logic on ELB itself so as to redirect Mobile traffic to another EC2 instance ?