batch requests for google classroom

[Jakub Mitura]

I am working on an app that is uploading data to Google Classroom using AppScript. I use two methods a lot:

/*
 *@description adding grade to the submission
 *@param courseId {string} id of clasroom in which there is coursework that we are intrested in
 *@param courseWorkId {string} id of coursework in which there is submission that we are intrested in
 *@param submId {string} submission id of submission to which we want to set mark*/
function setMark(courseId, courseWorkId, submIdd, mark) {
  var maark = parseFloat(mark) || 0
  if (maark < 0) {
    maark = 0
  }
  var studentSubmissionRes = {
      'assignedGrade': maark,
      'draftGrade': maark
    }
  var extra = {
    'updateMask': 'assignedGrade,draftGrade'
  };
  Classroom.Courses.CourseWork.StudentSubmissions.patch(studentSubmissionRes,
    courseId, courseWorkId, submIdd, extra)
}

/**
 *@description  addind link to the submission
 *@param fileUrl {string} url of file we want to add to submission
 *@param courseId {string} id of clasroom in which there is coursework that we are intrested in
 *@param courseWorkId {string} id of coursework in which there is submission that we are intrested in
 *@param submId {string} submission id of submission to which we want to add the link
 */
function setLinkTosubmission(fileUrl, courseId, courseWorkId, submId) {
  var request = ModifyAttachmentsRequest = {
    'addAttachments': [{
      'link': {
        'url': fileUrl
      }
    }]
  }
  Classroom.Courses.CourseWork.StudentSubmissions.modifyAttachments(request, courseId, courseWorkId, submId)
}

Both of them work, but i would like to improve performance and batch requests to add link or grade, as is possible in Google Sheets API, but I cannot find a way to do this.

Also, is there a possibility to batch update text in many documents in at once?

P.S. I asked It also previously on stack overflow I got good answer Hovewer this answer used Global HTTP Batch Endpoints  which will cease to work