Custom Html Script for `BlogPosting` type `Article` in Google structured data

BlogPostingCustomHTML.html

<script>
  (function(){
    var schema=
      {
      "@context": "http://schema.org",
      "@type": "BlogPosting",
      "mainEntityOfPage": {
        "@type": "WebPage",
        "@id": {{Page URL}}
      },
      "headline": {{Blog_Headline}},
      "image": {
        "@type": "ImageObject",
        "url": {{Blog_Image_URL}},
      },
      "author": {
        "@type": "Person",
        "name": {{Blog_Author_Name}},
        "url": {{Blog_Author_URL}}
      },
      "datePublished": {{Blog_Date_Published}},
      "publisher": {
        "@type": "Organization",
        "name": {{Blog_Publisher_Name}},
        "logo": {
          "@type": "ImageObject",
          "url": {{Blog_Publisher_Logo_URL}},
        }
      },
      "description": {{Blog_Description}}
      }

    // TODO:: These details can be added
    // "dateModified": {{Blog_Date_Modified}},

    var script=document.createElement('script');
    script.type="application/ld+json";
    script.innerHTML=JSON.stringify(schema);
    document.getElementsByTagName('head')[0].appendChild(script);
  })(document);
</script>