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But for instance, one needs them when editing config.json of anki-forvo-dl • Forvo Downloader (fully automatic, with bulk-add mode) :
{
    "appendAudio": true,
    "noteTypeSpecific": [
        {
            "id": 1234567898765,
            "searchField": "Wheatfield"
        },
        {
            "id": 1234567898765,
            "searchField": "Playingfield",
            "audioField": "Fieldday"
        }
    ],
    "deckSpecific": [
        {
            "id": 1234567890987,
            "language": "en"
...
    ]
}