jyosei-guide/layouts/_default/_markup/render-codeblock-csv.html

{{ $rows := .Inner | transform.Unmarshal }}
<table class="csv-table">
{{- if .Attributes.header | default true }}
<thead><tr>{{ range (index $rows 0) }}<th>{{- . -}}</th>{{ end }}</tr></thead>
{{- $rows = after 1 $rows -}}
{{- end }}
<tbody>
{{ range $rows -}}
<tr>{{ range . }}<td>{{- . | markdownify -}}</td>{{ end }}</tr>
{{ end -}}
</tbody>
</table>