Export your product reviews to a CSV File
Install using Composer.
composer require pauloharaujos/magento2-export-reviews
php bin/magento module:enable PHAS_ExportReviews
php bin/magento setup:upgrade
php bin/magento phas:export_reviews
The var/approved_reviews_export.csv file will be created
Use the following endpoint to get all approved reviews:
/rest/all/V1/review/approved/
Use the following endpoint to get all approved reviews by SKU:
/rest/all/V1/review/approved/{sku}