Facts

Facts are a bit of data on the server that configuration frameworks like puppet and ansible can read and take advantage of. The facts for ansible go in /etc/ansible/facts.d and can be a file that contains JSON or INI format or an executable script that returns JSON. The extension is .fact. These facts are then available via ansible <hostname> -m setup

/etc/ansible/facts.d/preferences.fact

[general]
asdf=1
bar=2

ansible <hostname> -m setup -a "filter=ansible_local"

"ansible_local": {
        "preferences": {
            "general": {
                "asdf" : "1",
                "bar"  : "2"
            }
        }
 }

Reference

Ansible Facts.d