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How could I add json object in the script label

I want to add the json object in the script label , which would be changed in different page, so i try to write as follows:

  head(){
      const vm = this;
      var html = JSON.stringify({
        "@context": "https://ziyuan.baidu.com/contexts/cambrian.jsonld",
        "@id": vm.$route.fullPath,
        "appid": "1572719465218098",
        "title": vm.tdk.title,
        "images": [
         "https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/bd_logo1_31bdc765.png",
          "https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo_top_ca79a146.png ",
          "https://m.baidu.com/static/index/plus/plus_logo.png "
        ],
        "description": vm.tdk.desc,
        "pubDate": "2017-08-15T08:00:01"
      });
      return {
        title: this.tdk.title,
        meta: [
          {hid: 'description', name: 'description', content: this.tdk.desc},
          {hid: 'keyword', name: 'keywords', content: this.tdk.keys}
        ],
        link: [{rel: "canonical", href: this.url}],
        script:[
          {
            type: "application/ld+json",
            innerHTML: html
          }
        ]
      }
    }

howerer , when i check the code in my web pgae , the quotation marks in json object in the script label had been transformed to ‘"’ , just like this

<script data-n-head="true" type="application/ld+json">
{&quot;@context&quot;
:&quot;https://ziyuan.baidu.com/contexts/cambrian.jsonld&quot;
,&quot;@id&quot;
:&quot;/news/detail-28545&quot;,
&quot;appid&quot;:&quot;1572719465218098&quot;,&quot;title&quot;:&quot;
钢铁价格  2017年12月1日乐从钢铁世界价格_手机钢铁世界网&quot;,
&quot;images&quot;:[&quot;https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/bd_logo1_31bdc765.png&quot;,&quot;https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo_top_ca79a146.png &quot;,&quot;https://m.baidu.com/static/index/plus/plus_logo.png &quot;]
,&quot;description&quot;:&quot;
手机昨日，唐山普碳方坯再涨30元至3890元/吨含税出厂，准备破3900元大关；成材价格继续上涨，特别是螺纹钢，部分地区的螺纹已经比冷轧价格还要高；昨日钢铁世界地磅指数录得114点，出货状况异常火爆！今日早盘，期螺、热卷期货涨势有所回落，但原燃料期货延续涨势，下面来看今早最新价格情况。&quot;,&quot;pubDate&quot;:&quot;2017-08-15T08:00:01&quot;}</script>

so i want to know how could i avoid this problem , that the quotations marks be transformed to '"’
thanks a lot
looking forward to your reply
tks

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How could I add json object in the script label