Actually, I want to add different SSL certificates on the same port. As per the AWS document, SNI is now possible via using Application Loadblancer (https://aws.amazon.com/blogs/aws/new-application-load-balancer-sni/)
They have specified the steps via AWS console or CLI, but want to perform this via AWS Cloudformation.
I have setup Application Loadblancer via aws document (https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/environments-cfg-alb.html) and its working fine. It's just I have to add additional certificate to my 443 port.