Google Recently Published New Robots Meta tags for Optimization of Search Pages for snippet and post preview.
Page Contents
Add New Robots Meta Tags to Blogger Blog.

New Google Meta Tags to Enhance SEO, CTR in Search Results. Now Google provides snippet settings options to site owners to control the content that is visible in Google Search Engine Pages.
You can add the following robots meta tag into your website article page.
<meta content='max-snippet:-1, max-image-preview:large, max-video-preview:-1' name='robots'/>
This Robots meta tag describes the setting for snippet preview of a web article.
Understand the robots meta tag contents declares.
'max-snippet:-1'
declares that preview snippets will not have any word limit.
max-image-preview:large
declares that image size in snippets will be large.
You can read completely about new robots meta tag here
How to Add new in Blogger Blog
You can add new robots meta tag into your Blogger blog by implementing the following web codes in the blogger’s theme file. Learn How to Edit Blogger theme.
<b:if cond='!data:view.isHomepage and !data:view.isSingleItem'>
<meta content='noindex,follow' name='robots'/>
<else/>
<meta content='max-snippet:-1, max-image-preview:large, max-video-preview:-1' name='robots'/>
</b:if>
The noindex, follow tags are used here for pages other than the homepage, post, and pages. Understand this here.
How to Add in WordPress CMS
Using Plugin Yoast SEO
You can add robots meta tags by simply installing the Yoast SEO Plugin, and it will automatically add these tags to all articles that are not noindex. To understand how to noindex and which kind of content to noindex, read this article.
Without Plugin – Using Code.
<b:if cond='!data:view.isHomepage and !data:view.isSingleItem'>
<meta content='noindex,follow' name='robots'/>
<else/>
<meta content='max-snippet:-1, max-image-preview:large, max-video-preview:-1' name='robots'/>
</b:if>
noindex, follow tags are used here for pages other than the homepage, post, and pages. Understand this here.