{% for item in groups['all'] %}
{% if hostvars[item].ansible_ssh_host_key_ecdsa_public is defined %}
{{ item }} ecdsa-sha2-nistp256 {{ hostvars[item].ansible_ssh_host_key_ecdsa_public }}
{{ hostvars[item].ansible_hostname }} ecdsa-sha2-nistp256 {{ hostvars[item].ansible_ssh_host_key_ecdsa_public }}
{{ hostvars[item].ansible_default_ipv4.address }} ecdsa-sha2-nistp256 {{ hostvars[item].ansible_ssh_host_key_ecdsa_public }}
{% endif %}
{% endfor %}