how to send json payload in body?

[syberkitten]

is it possible to add extra data with the files,
like (in dropzone):

params: {
    payload: JSON.stringify(
      {'subsystem': 'goali', 'version': '0.1.2', 'md5': '123456', 'payloadIds': []}
    )
  },

or postData (Prop) in vue2-multi-uploader ?

Thanks