Auto scaling group & TLS certificates

The nomad-auto-join demo here:

Configures the nomad/consul servers with an AWS auto_scaling_group

However, the consul deployment guide:

Suggests that I need to configure individual certificates per-server so that consul can communicate over TLS.

I’m not aware of how an auto scaling group can add different certificates (or any configuration for that matter) to each instance. Any ideas on how to continue using an auto scaling group but also have individual certificates on each instance?