After the cache settings are activated the fact cache is being written to fact_cache/ subdirectory
The original Ansible's script is here
To enable the json fact caching (suppose you're in the root of your Ansible project):
mkdir fact_cache
cat >> ovirt.ini<<EOF
ovirt_cache = True
ovirt_cache_path = fact_cache/ovirt_inventory.cache
ovirt_cache_max_age = 3600
EOF
export ANSIBLE_CACHE_PLUGIN=jsonfile
export ANSIBLE_CACHE_PLUGIN_TIMEOUT=36000
export ANSIBLE_CACHE_PLUGIN_CONNECTION=fact_cache/