When using the JSON DataProvider and importing a csv string that is going to be mapped to an Umbraco.MultiNodeTreePicker property you have to format the JSON like this:

{
    "Authors": "Jane Eyre,Charles Dickens,Virginia Woolf,George Orwell"
}

It would be wonderful if the JSON could be formatted like an array. Like this:

{
    "Authors": [
        "Jane Eyre",
        "Charles Dickens",
        "Virginia Woolf",
        "George Orwell"
    ]
}

If I'm generating the JSON via code having the array of strings is much more natural than having a csv string as a property value.

Thanks!