How to Add Rich Snippets for Blogger Post

Go to your theme, find <data:post.body/> and put following code just after:

<script type='application/ld+json'>
{&quot;@context&quot;:&quot;http://schema.org/&quot;,&quot;@type&quot;:&quot;Review&quot;,&quot;itemReviewed&quot;:{&quot;@type&quot;:&quot;Thing&quot;,&quot;name&quot;:&quot;<data:post.title/>&quot;},&quot;author&quot;:{&quot;@type&quot;:&quot;Person&quot;,&quot;name&quot;:&quot;<data:post.author/> &quot;},&quot;reviewRating&quot;:{&quot;@type&quot;:&quot;Rating&quot;,&quot;ratingValue&quot;:&quot;10&quot;,&quot;bestRating&quot;:&quot;10&quot;},&quot;publisher&quot;:{&quot;@type&quot;:&quot;Organization&quot;,&quot;name&quot;:&quot;<data:post.author/>&quot;}}
</script>

Note:
• - Maybe in your theme have some code <data:post.body/>, so you must chose right.
• - You can change score in marked code above.