Convert an Array To a Nested JSON

I am struggling the last days with an unresolved problem for me. I am stuck on this problem for long time that's why I took the decision to ask for your help.

I'm reading an Excel file and got the following array which I am now trying to convert it to a nested JSON to get accepted from the mongoDB but unfortunately I have difficulties to get there.

var arr = ["number,isnewLanguage,label,numberOfChoices,languages/language,questions/mainText/language,questions/subText/language,questions/choices/language,questions/fields/langugage",
  "1,false,label1,5,English,MAinText1,SubText1,choices1,false",
  "2,false,label2,5,English,MAinText2,SubText2,choices2,false",
  "3,true,label1,false,Italian,MainTextItalian1,SubTextItalian1,choicesItalian1,false",
  "4,true,label2,false,Italian,MAinTextItalian2,SubTextItalian2,choicesItalian2,false"
]

I would like to end up with the following structure. Here is a fiddle with my work https://jsfiddle.net/argusDob/3py6fd8m/2/

var json = [{
    number: 1,
    label1: "label1",
    numberOfChoices: 5,
    languages: [{
        language: "English",
        questions: [{
          mainText: "MainText1",
          subText: "subText1",
          choices: "choices1",
          fields: "false"
        }]
      },
      {
        language: "Italian",
        questions: [{
          mainText: "MainTextItalian1",
          subText: "subTextItlaian1",
          choices: "choicesItalian1",
          fields: "false"
        }]
      }
    ]
  },
  {
    number: 2,
    label1: "label2",
    numberOfChoices: 5,
    languages: [{
        language: "English",
        questions: [{
          mainText: "MainText2",
          subText: "subText2",
          choices: "choices2",
          fields: "false"
        }]
      },
      {
        language: "Italian",
        questions: [{
          mainText: "MainTextItalian2",
          subText: "subTextItlaian2",
          choices: "choicesItalian2",
          fields: "false"
        }]
      }
    ]
  }
]

var arr = ["number,isnewLanguage,label,numberOfChoices,languages/language,questions/mainText/language,questions/subText/language,questions/choices/language,questions/fields/langugage",
  "1,false,label1,5,English,MAinText1,SubText1,choices1,false",
  "2,false,label2,5,English,MAinText2,SubText2,choices2,false",
  "3,true,label1,false,Italian,MainTextItalian1,SubTextItalian1,choicesItalian1,false",
  "4,true,label2,false,Italian,MAinTextItalian2,SubTextItalian2,choicesItalian2,false"
]

var attrs = arr.splice(0, 1);
var test = [];

var result = arr.map(function(row, idx) {
  var myObj = {};
  var array = [];

  var therows = row.split(",").slice(1);
  console.log(therows[0]);
  therows.forEach(function(value, i) {

    var myKeys = attrs[0].split(",").slice(1)
    var theKeys = myKeys[i]

    if (theKeys.split('/').length === 1) {
      myObj[theKeys] = value;
    }

    //languages
    var theLanguagesKey = theKeys.split("/")[0]
    if (theKeys.split("/").length == 2) {
      if (!myObj["languages"]) {
        var theNewLanguage = {}
        myObj["languages"] = [];
        theNewLanguage[theKeys.split('/')[1]] = value;
        myObj["languages"].push(theNewLanguage);
      }
    }
    //questions
    if (theKeys.split("/").length == 3) {
      if (!myObj["questions"]) {
        var theNewQuestions = {}
        myObj["questions"] = [];
        theNewQuestions[theKeys.split('/')[1]] = value;
        myObj["questions"].push(theNewQuestions);
      } else {
        for (var i = 0; i < myObj["questions"].length; i++) {
          myObj["questions"][i][theKeys.split('/')[1]] = value;
        }
      }

    }

  })
  test.push(myObj)
})
console.log(test)