Append filles as an array to formData - forms

Question

I am trying to iterate over list elements and for each elements retrive the file from an input. I can do this just find using the bellow code, but what I would like to do is have each file under a common array.
I've been trying different things, with creating an array and appending it first to the form Data, and then appending each item, but I couldn't get to ge the wanted structure.
This is what I have:
$('.noticeboard-li').each(function (index, item) {
if($(this).find('.custom-file-input')[0].files[0]) {
formData.append('noticeboardFiles'+index, $(this).find('.custom-file-input')[0].files[0]);
}
});
Output:
Array
(
[noticeboardFiles0] => Array
(
[name] => pic_1.jpg
[type] => image/jpeg
[tmp_name] => /tmp/phpdv5Uz1
[error] => 0
[size] => 47542
)
[noticeboardFiles1] => Array
(
[name] => pic_2.png
[type] => image/png
[tmp_name] => /tmp/phpEKCy6M
[error] => 0
[size] => 47542
)
)
This is how I would like the structure:
Array
(
[noticeboardFiles] => Array(
[0] => Array
(
[name] => pic_1.jpg
[type] => image/jpeg
[tmp_name] => /tmp/phpdv5Uz1
[error] => 0
[size] => 47542
)
[1] => Array
(
[name] => pic_2.png
[type] => image/png
[tmp_name] => /tmp/phpEKCy6M
[error] => 0
[size] => 47542
)
)
)