ansible dynamic hostname from ec2 tag

gistfile1.md

In my dynamic ec2 inventory I have data similar to:

{
  "_meta": {
    "hostvars": {
      "10.0.33.123": {
        "ec2_tag_Name": "MyFirstHost",
      }
      "10.0.33.124": {
        "ec2_tag_Name": "MySecondHost",
      }
    }
  }
}

How do I make the equivallent of this task work properly in ansible?

- hostname: "{{ hostvars[ {{ ansible_eth0['ipv4']['address'] }} ]['ec2_tag_Name'] }}"

So that the hostname is set correctly on both hosts:

root@10.0.33.123:/# hostname
MyFirstHost

root@10.0.33.124:/# hostname
MySecondHost