[fileservers]
fs01.example.com   ansible_ssh_host=192.168.1.1    ip_addr=192.168.1.1

[dbservers]
db01.example.com   ansible_ssh_host=192.168.1.2    ip_addr=192.168.1.2

[webservers]
web01.example.com   ansible_ssh_host=192.168.1.3    ip_addr=192.168.1.3

[cmsservers]
cms01.example.com   ansible_ssh_host=192.168.1.4    ip_addr=192.168.1.4

- name: create alias facts
  set_fact:
    file_server_alias: hostvars[{{ inventory_hostname }}]['groups']['fileservers'][0]  # should get string 'fs01.example.com'
    db_server_alias: hostvars[{{ inventory_hostname }}]['groups']['dbservers'][0]      # should get string 'db01.example.com'
    cms_server_alias: hostvars[{{ inventory_hostname }}]['groups']['cmsservers'][0]    # should get string 'cms01.example.com'