Send additional info to server in uploading image process

im using filepond 4.25.1 on vue 2.6.11 and everything work without problem until now. i want to send additional information to my server which is aspnet core 3. i send my request from filepond like below

myServer: {
        url: "http://**********/api/CustomerAuth/",
        process: {
          url: "uploadimages",
          method: "POST",
          withCredentials: false,
          headers: {},
          data: {
            nationalcode: "1234567890",
            typecode:"1"
          },
          timeout: 7000,
        },
        load: (source, load) => {
          fetch(source)
            .then((res) => res.blob())
            .then(load);
        },
      }

and server side

[HttpPost("uploadimages")]
    public IActionResult UploadImages()
    {
        try
        {
            var file = Request.Form.Files[0];
            string folderName = "Upload";
            string webRootPath = _hostingEnvironment.WebRootPath;
            string newPath = Path.Combine(webRootPath, folderName);
            if (!Directory.Exists(newPath))
            {
                Directory.CreateDirectory(newPath);
            }
            if (file.Length > 0)
            {
                string fileName = 
      ContentDispositionHeaderValue.Parse(file.ContentDisposition).FileName.Trim('"');
                string fullPath = Path.Combine(newPath, fileName);
                using (var stream = new FileStream(fullPath, FileMode.Create))
                {
                    file.CopyTo(stream);
                }
            }
            return Ok("Upload Successful");
        }
        catch (System.Exception ex)
        {
            return NotFound(new { img_upld_error = ex.Message });
        }
    }

in server side i need to access "nationalcode" and "typecode" which is send as data in process and value of these two parameters always change so its not static value and with interact of user value of this two always change.

I really appreciated if someone give me a some clue or guide me to solve my problem.