Mryntu

<?php
$objectManager = MagentoFrameworkAppObjectManager::getInstance();
$product = $objectManager->get('MagentoFrameworkRegistry')->registry('current_product');
$storeManager = $objectManager->get('MagentoStoreModelStoreManagerInterface');
$currentStoreId = $storeManager->getStore()->getId();
$rating = $objectManager->get("MagentoReviewModelResourceModelReviewCollectionFactory");
$reviewFactory = $objectManager->create('MagentoReviewModelReview');

$collection = $rating->create()->addStoreFilter(
 $currentStoreId
 )->addStatusFilter(
 MagentoReviewModelReview::STATUS_APPROVED
 )->addEntityFilter(
 'product',
 $product->getId()
 )->setDateOrder();
 $reviewlist = $collection->getData();
 foreach ($reviewlist as $review) 
 
 echo "<pre/>";
 print_r($review);
 

#######################################################

Output
 [review_id] => 
 [created_at] => 
 [entity_id] => 
 [entity_pk_value] => 
 [status_id] => 
 [detail_id] => 
 [title] => 
 [detail] => 
 [nickname] => 
 [customer_id] => 
 [entity_code] => 

In that I can not get the review star per review with the help of object manager.
I want highlighted box value

Try to use bellow code in your phtml file You should not use the ObjectManager directly!

<?php
$productId = 'your_product_id';
$objectManager = MagentoFrameworkAppObjectManager::getInstance();
$reviewFactory = $objectManager->create('MagentoReviewModelReview');
$product = $objectManager->create('MagentoCatalogModelProduct')->load($productId);
$storeManager = $objectManager->create('MagentoStoreModelStoreManagerInterface');
$storeId = $storeManager->getStore()->getStoreId();
$reviewFactory->getEntitySummary($product, $storeId);

$ratingSummary = $product->getRatingSummary()->getRatingSummary();
$reviewCount = $product->getRatingSummary()->getReviewsCount();
?>
<?php if($ratingSummary) ?>
<div class="product-reviews-summary short">
 <div class="rating-summary">
 <div title="<?php echo (int)$ratingSummary; ?>%" class="rating-result">
 <span style="width:<?php echo (int)$ratingSummary; ?>%"><span><?php echo (int)$ratingSummary; ?>%</span></span>
 </div>
 </div>
 <div class="reviews-actions">
 <?php echo __('('.$reviewCount.') Reviews'); ?>
 </div>
</div>
<?php ?>

you need to call $collection->load()->addRateVotes();, than get ratings
for each review by calling $review->getRatingVotes();

I found one link that helps to get a collection of each review

 <?php 
 use MagentoFrameworkAppBootstrap; 
 require __DIR__ . '/app/bootstrap.php'; 
 $bootstrap = Bootstrap::create(BP, $_SERVER); 
 $obj = $bootstrap->getObjectManager(); 
 $state = $obj->get('MagentoFrameworkAppState'); 
 $state->setAreaCode('frontend'); 

 $reviewId = 5; //custom review id. 
 $ratingCollection = $obj->get('MagentoReviewModelResourceModelRatingOptionVoteCollection')
 ->addRatingInfo()
 ->addOptionInfo()
 ->addRatingOptions()
 ->addFieldToFilter('review_id',$reviewId); 
 print_r($ratingCollection->getData());