layouts/partials/seo/structured/breadcrumbs-microdata.html

{{ $url := replace .Permalink .Site.BaseURL "" }}
{{ $local := newScratch }}
{{ $local.Add "path" .Site.BaseURL }}
{{ $local.Add "breadcrumb" (slice (dict "url" .Site.BaseURL "name" .Site.Title "position" 1 )) }}
{{ range $index, $element := split $url "/" }}
  {{ $local.Add "path" $element }}
  {{ $local.Add "path" "/" }}
  {{ if ne $element "" }}
    {{ $local.Add "breadcrumb" (slice (dict "url" ($local.Get "path") "name" . "position" (add $index 2))) }}
  {{ end }}
{{ end }}

<script type="application/ld+json">
{
  "@context": "http://schema.org",
  "@type": "BreadcrumbList",
  "itemListElement": [{{ range $local.Get "breadcrumb" }}{{ if ne .position 1 }},{{ end }}{
        "@type": "ListItem",
        "position": {{ .position }},
        "item": {
          "@id": {{ .url }},
          "name": "{{ .name }}"
        }
    }{{ end }}]
}
</script>