If you need to display tag count in the Magento 2 Blog tag cloud sidebar, you need to extend the tags sidebar template.
To do this:
1. Copy the template file from the Blog extension folder
view/frontend/templates/sidebar/tag_claud.phtml
to your theme folder
app/design/frontend/ThemeVendor/themename/Magefan_Blog/templates/sidebar/tag_claud.phtml
2. Add the code
<?= $tag->getCount() ?>
inside the loop
<?php foreach ($tags as $tag) { ?>
