Well it works

ansible/hosts.j2

@@ -0,0 +1,3 @@
+{% for host in hostvars %}
+{{ hostvars[host]['ansible_facts']['enp5s0']['ipv4']['address'] }} {{ host }}
+{% endfor %}

ansible/playbook.yml

@@ -0,0 +1,8 @@
+---
+- hosts: all
+  tasks:
+    - name: Replace /etc/hosts
+      template:
+        src: hosts.j2
+        dest: /etc/hosts
+