Hi,
The aggregateRating comes from the code:
if ($row->hikashop_vote_total_vote > 0) {
?>
<div style="display: none;">
<div itemprop="aggregateRating" itemscope itemtype="http://schema.org/AggregateRating">
<span itemprop="ratingValue"><?php echo $row->hikashop_vote_average_score; ?></span>
<span itemprop="bestRating"><?php echo $row->hikashop_vote_nb_star; ?></span>
<span itemprop="ratingCount"><?php echo $row->hikashop_vote_total_vote; ?></span>
<span itemprop="itemReviewed">Product</span>
</div>
</div>
<?php } ?>
in the file "mini" of the view "vote" via the menu Display>Views.