{
    "add-lines": [
        {
            "file": "config/packages/notifier.yaml",
            "position": "after_target",
            "warn_if_missing": true,
            "target": "        chatter_transports:",
            "content": [
                "            slack: '%env(SLACK_DSN)%'"
            ]
        }
    ],
    "env": {
        "#1": "SLACK_DSN=slack://TOKEN@default?channel=CHANNEL"
    }
}