The Stellar plugin allows displaying rating not only on the pages of your site but also in Google search results.
The option is available in the menu item Stellar>Results>Schema Markup
This setting adds schema markup to the page HTML code. Schema markup is one of the ways to add review structured data to a page.
Please note that the plugin adds the necessary markup for the possibility to display the rating in Google search result, but can not guarantee this since only Google algorithms determine whether review snippet will be displayed or not.
Your site content must follow with a number of rules to be eligible to appear as a rich result. More detailed information is in the Google documentation.