Google Star Rating

Hey, can someony tell me how to add the 5 Stars in Organic Search?
I installed the plugin starrating but iam not sure if the plugin does it.
Thank you very much.

My Website : nhi-systems.de

i Mean this :
<img src="//cdck-file-uploads-canada1.s3.dualstack.ca-central-1.amazonaws.com/flex036/uploads/getgrav/original/1X/5920cd084dece59781ea3ad76b101b6046b44475.jpg" width="690" height="118">

@NHISystems
his is generated by “schema.org markup”, “structured data” or “microdata”.

get started with
https://www.ianbrodie.com/get-star-ratings-google-search-results/

it can be achieve easily by a plugin or shortcode with Grav

then test it with

https://search.google.com/structured-data/testing-tool?hl=en

Actually this is supported in the star-ratings plugin: https://github.com/getgrav/grav-plugin-star-ratings#aggregate-rating