core/homeassistant/components/duckdns/strings.json

{
  "services": {
    "set_txt": {
      "name": "Set TXT",
      "description": "Sets the TXT record of your DuckDNS subdomain.",
      "fields": {
        "txt": {
          "name": "TXT",
          "description": "Payload for the TXT record."
        }
      }
    }
  }
}