Do you keep customer reviews on your site?
Why not make it available on Google Searchas a search box for your users as well?
With JSON+LD, you can make it easy for Google to find and to potentially display your Webflow Site Search directly in Google's search results.
I personally like to put reviews in a CMS collection, so that I can automate importing of new reviews from e.g. Google Maps or Facebook.
This also allows me to sidebar reviews easily on my site, and show the top ranked ones on the homepage.
For the JSON+LD, it makes the most sense then to put it on the individual Review collection page itself.
Here's an example of resulting LSON+LD code;
And how it looks in the code editor with embedded CMS fields.
Key fields;
Google's documentation on reviews
https://search.google.com/test/rich-results