I tried, app/design/frontend/Test/abc/Magento_Review/layout/review_product_list.xml
<?xml version="1.0"?>
<page layout="1column" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
<body>
<referenceContainer name="page.bottom.container">
<referenceBlock name="product.info.product_additional_data">
<action method="setTemplate">
<argument name="template" xsi:type="string">Magento_Review::product/view/list.phtml</argument>
</action>
</referenceBlock>
</referenceContainer>
</body>
</page>
app/design/frontend/Test/abc/Magento_Review/templates/product/view/list.phtml
<?php
$_items = $block->getReviewsCollection()->getItems();
$format = $block->getDateFormat() ?: \IntlDateFormatter::SHORT;
?>
<?php if (count($_items)):?>
<div class="block review-list" id="customer-reviews">
<div class="block-title">
<strong><?php /* @escapeNotVerified */ echo __('Customer Reviews new24234') ?></strong>
</div>
<div class="block-content">
<div class="toolbar review-toolbar">
<?php echo $block->getChildHtml('toolbar') ?>
</div>
<ol class="items review-items">
<?php foreach ($_items as $_review):?>
<li class="item review-item" itemscope itemprop="review" itemtype="http://schema.org/Review">
<div class="review-title" itemprop="name"><?php echo $block->escapeHtml($_review->getTitle()) ?></div>
<?php if (count($_review->getRatingVotes())): ?>
<div class="review-ratings">
<?php foreach ($_review->getRatingVotes() as $_vote): ?>
<div class="rating-summary item" itemprop="reviewRating" itemscope itemtype="http://schema.org/Rating">
<span class="label rating-label"><span><?php echo $block->escapeHtml($_vote->getRatingCode()) ?></span></span>
<div class="rating-result" title="<?php /* @escapeNotVerified */ echo $_vote->getPercent() ?>%">
<meta itemprop="worstRating" content = "1"/>
<meta itemprop="bestRating" content = "100"/>
<span style="width:<?php /* @escapeNotVerified */ echo $_vote->getPercent() ?>%">
<span itemprop="ratingValue"><?php /* @escapeNotVerified */ echo $_vote->getPercent() ?>%</span>
</span>
</div>
</div>
<?php endforeach; ?>
</div>
<?php endif; ?>
<div class="review-content" itemprop="description">
<?php echo nl2br($block->escapeHtml($_review->getDetail())) ?>
</div>
<div class="review-details">
<p class="review-author">
<span class="review-details-label"><?php /* @escapeNotVerified */ echo __('Review by')?></span>
<strong class="review-details-value" itemprop="author"><?php echo $block->escapeHtml($_review->getNickname()) ?></strong>
</p>
<p class="review-date">
<span class="review-details-label"><?php /* @escapeNotVerified */ echo __('Posted on') ?></span>
<time class="review-details-value" itemprop="datePublished" datetime="<?php /* @escapeNotVerified */ echo $block->formatDate($_review->getCreatedAt(), $format) ?>"><?php /* @escapeNotVerified */ echo $block->formatDate($_review->getCreatedAt(), $format) ?></time>
</p>
</div>
</li>
<?php endforeach; ?>
</ol>
<div class="toolbar review-toolbar">
<?php echo $block->getChildHtml('toolbar') ?>
</div>
</div>
</div>
<?php endif;?>
Also created register.php, composer file and theme.xml in Test/abc folder and in backend theme is assigned.
But its not working.