MultipartUpload nested Params

[Clonk-HTML5]

If i try to use nested Params like this:

[{
 "name": "form_data[94]",
  "value": "TEsts"
 }, {
 "name": "form_data[100]",
  "value": "50"
 }, {
  "name": "form_data[101][0]",
  "filename": "/storage/emulated/0/Download/tenor.gif",
  "mimeType": "image/jpeg"
 },{
  "name": "form_data[101][1]",
  "filename": "/storage/emulated/0/Download/test.gif",
  "mimeType": "image/jpeg"
 }, {
  "name": "member",
  "value": "304"
 }]

I get a ResponseCode = -1

Is there any Solution for nested FormData with this Plugin ?