Custom meta tags feature help you create page titles, meta descriptions, and keywords tags that can provide Google with additional information about your store pages. Google can use this information to create rich snippets or enable the sorting of search results.
Here is how you can set up custom meta tags
From the left panel in your dashboard go to Marketing -> SEO -> Custom meta tags
Click on Add custom meta tag
Select the page and categories on which you want to add the tag
Give a title for the property and add content.
You can manage all the custom meta tags under one section “Custom Meta Tags”