use https://github.com/nunocoracao/blowfish.git

themes/blowfish/layouts/partials/schema.html

@@ -0,0 +1,49 @@
+{{ if .IsHome -}}
+  <script type="application/ld+json">
+  {
+    "@context": "https://schema.org",
+    "@type": "WebSite",
+    "@id": "{{ (site.GetPage "/").Permalink | safeURL }}",
+    "name": "{{ .Site.Title | safeJS }}",
+    {{ with .Site.Params.description }}"description": "{{ . | safeJS }}",{{ end }}
+    {{ with .Site.LanguageCode }}"inLanguage": "{{ . }}",{{ end }}
+    "url": "{{ (site.GetPage "/").Permalink | safeURL }}",
+    {{ with .Site.Params.keywords }}"keywords": {{ . }},{{ end }}
+    "publisher" : {
+      "@type": "Person",
+      "name": "{{ .Site.Author.name | safeJS }}"
+    }
+  }
+  </script>
+{{ else if .IsPage }}
+  {{- $iso8601 := "2006-01-02T15:04:05-07:00" -}}
+  <script type="application/ld+json">
+  [{
+    "@context": "https://schema.org",
+    "@type": "Article",
+    "articleSection": "{{ (site.GetPage .Section).Title | safeJS }}",
+    "name": "{{ .Title | safeJS }}",
+    "headline": "{{ .Title | safeJS }}",
+    {{ with .Description }}"description": "{{ . | safeJS }}",{{ end }}
+    {{ with .Summary }}"abstract": "{{ . | safeJS }}",{{ end }}
+    {{ with .Site.LanguageCode }}"inLanguage": "{{ . }}",{{ end }}
+    "url" : "{{ .Permalink }}",
+    "author" : {
+      "@type": "Person",
+      "name": "{{ .Site.Author.name | safeJS }}"
+    },
+    {{ with .PublishDate }}"copyrightYear": "{{ .Format "2006" }}",{{ end }}
+    {{ with .Date }}"dateCreated": "{{ .Format $iso8601 }}",{{ end }}
+    {{ with .PublishDate }}"datePublished": "{{ .Format $iso8601 }}",{{ end }}
+    {{ with .ExpiryDate }}"expires": "{{ .Format $iso8601 }}",{{ end }}
+    {{ with .Lastmod }}"dateModified": "{{ .Format $iso8601 }}",{{ end }}
+    {{ if .Keywords }}
+    {{ with .Keywords }}"keywords": {{ . }},{{ end }}
+    {{ else }}
+    {{ with .Params.tags }}"keywords": {{ . }},{{ end }}
+    {{ end }}
+    "mainEntityOfPage": "true",
+    "wordCount": "{{ .WordCount }}"
+  }]
+  </script>
+{{ end }}