Lyric line metadata

Each line of lyrics has its own optional metadata, including the language code and a label. This lives in the top-level "global" attribute, as a "lyrics" object.
{
   "mnx": {
      "version": 1
   },
   "global": {
      "lyrics": {
         "lineMetadata": {
            "1": {
               "label": "English",
               "lang": "en"
            },
            "2": {
               "label": "Nederlands",
               "lang": "nl"
            },
            "3": {
               "label": "Українська",
               "lang": "uk"
            },
            "4": {
               "label": "Español",
               "lang": "es"
            }
         },
         "lineOrder": [
            "1",
            "2",
            "3",
            "4"
         ]
      },
      "measures": [
         {
            "time": {
               "count": 4,
               "unit": 4
            }
         },
         {}
      ]
   },
   "parts": [
      {
         "measures": [
            {
               "clefs": [
                  {
                     "clef": {
                        "sign": "G",
                        "staffPosition": -2
                     }
                  }
               ],
               "sequences": [
                  {
                     "content": [
                        {
                           "duration": {
                              "base": "half"
                           },
                           "lyrics": {
                              "lines": {
                                 "1": {
                                    "text": "I"
                                 },
                                 "2": {
                                    "text": "Ik"
                                 },
                                 "3": {
                                    "text": "Я"
                                 },
                                 "4": {
                                    "text": "¡Yo"
                                 }
                              }
                           },
                           "notes": [
                              {
                                 "pitch": {
                                    "octave": 4,
                                    "step": "G"
                                 }
                              }
                           ]
                        },
                        {
                           "duration": {
                              "base": "half"
                           },
                           "lyrics": {
                              "lines": {
                                 "1": {
                                    "text": "am"
                                 },
                                 "2": {
                                    "text": "ben"
                                 },
                                 "3": {
                                    "type": "start",
                                    "text": "І"
                                 },
                                 "4": {
                                    "text": "soy"
                                 }
                              }
                           },
                           "notes": [
                              {
                                 "pitch": {
                                    "octave": 4,
                                    "step": "G"
                                 }
                              }
                           ]
                        }
                     ]
                  }
               ]
            },
            {
               "sequences": [
                  {
                     "content": [
                        {
                           "duration": {
                              "base": "whole"
                           },
                           "lyrics": {
                              "lines": {
                                 "1": {
                                    "text": "John!"
                                 },
                                 "2": {
                                    "text": "Jan!"
                                 },
                                 "3": {
                                    "type": "end",
                                    "text": "ван!"
                                 },
                                 "4": {
                                    "text": "Juan!"
                                 }
                              }
                           },
                           "notes": [
                              {
                                 "pitch": {
                                    "octave": 5,
                                    "step": "C"
                                 }
                              }
                           ]
                        }
                     ]
                  }
               ]
            }
         ]
      }
   ]
}