elementui如何进行复杂表格合并，原始数据带有数组

Question

    {
      "category": "牛",
      "currentQuantity": 110,
      "details": [
        {
          "category": "牛",
          "vaccineShortName": "口蹄疫",
          "finals": 33,
          "nots": 1,
          "notChildrens": 0,
          "notIlls": 0,
          "notPregnancies": 1,
          "completedDensity": "97.06",
          "planQuantity": 400,
          "surveyDensity": "8.25"
        },
        {
          "category": "牛",
          "vaccineShortName": "布病",
          "finals": 127,
          "nots": 6,
          "notChildrens": 2,
          "notIlls": 1,
          "notPregnancies": 3,
          "completedDensity": "95.49",
          "planQuantity": 500,
          "surveyDensity": "25.4"
        }
      ]
    },
    {
      "category": "羊",
      "currentQuantity": 211,
      "details": [
        {
          "category": "羊",
          "vaccineShortName": "口蹄疫",
          "finals": 165,
          "nots": 41,
          "notChildrens": 20,
          "notIlls": 0,
          "notPregnancies": 21,
          "completedDensity": "80.1",
          "planQuantity": 255,
          "surveyDensity": "64.71"
        },
        {
          "category": "羊",
          "vaccineShortName": "布病",
          "finals": null,
          "nots": null,
          "notChildrens": null,
          "notIlls": null,
          "notPregnancies": null,
          "completedDensity": 0,
          "planQuantity": 11,
          "surveyDensity": "0"
        },
        {
          "category": "羊",
          "vaccineShortName": "小反刍兽疫",
          "finals": null,
          "nots": null,
          "notChildrens": null,
          "notIlls": null,
          "notPregnancies": null,
          "completedDensity": 0,
          "planQuantity": 12,
          "surveyDensity": "0"
        },
        {
          "category": "羊",
          "vaccineShortName": "包虫病",
          "finals": null,
          "nots": null,
          "notChildrens": null,
          "notIlls": null,
          "notPregnancies": null,
          "completedDensity": 0,
          "planQuantity": 0,
          "surveyDensity": "0"
        }
      ]
    },
  ]
``

想实现效果如下:
![](/img/bVcXtl7)