I have created a Forms Workflow and want to add a FieldMapper property.

I have managed to add the property but would also like to prepopulate it with a set of mappings to be set.

Something like this:

I tried something like this but it doesn't work:

    public override Dictionary<string, SettingAttribute> Settings()
{
    var settings = base.Settings();

    var x = new List<FieldMapping>();
    x.Add(new FieldMapping
    {
        Alias = "Alias1",
        Value = "",
        StaticValue = ""
    });
    x.Add(new FieldMapping
    {
        Alias = "Alias2",
        Value = "",
        StaticValue = ""
    });
    settings["FieldMappings"].PreValues = JsonConvert.SerializeObject(x);

    return settings;
}

Is it actually possible to prepopulate this list?