Do I have to have comments to have stars?

Hello,

Thank you for contacting Rank Math today.

The plugin’s rich snippet review option expects that you already have some reviews for the post that you want to create a rating for. Google will however detect the ratings on the service schema that you have on the page and display the rating stars on the SERP since this will be displayed as an editor’s review.
I would suggest that you install the following review plugin from our store that can help in adding the reviews to your posts: https://mythemeshop.com/plugins/wordpress-review/

Looking forward to helping you. Thank you.

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Hello,

We are super happy that this resolved your issue. If you have any other questions in the future, know that we are here to help you.

If you don’t mind me asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/?rate=5#new-post about your overall experience with Rank Math? We appreciate your time and patience.

If you do have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.

Thank you.