ansible/roles/docker/templates/pi/ddns-updater/data/config.json

{
    "settings": [
        {
            "provider": "namecheap",
            "domain": "{{ local_domain }}",
            "host": "{{ local_subdomains }}",
            "password": "{{ vault_ddns_borgland_password }}",
            "provider_ip": true
        }
    ]
}