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About this issue you can use child theme to override template of shortcode display follow this topic tutorial:
How to customize WordPress theme using Child theme
In this case you need override:
wp-content/plugins/haru-formota-core/templates/recent-new/carousel.php (or other file if you choose other style at settings).
You can add this code to display readmore button:
<div class="icon-readmore">
<a href="<?php echo esc_url( get_the_permalink() ); ?>" title="<?php echo esc_attr( get_the_title() ); ?>" target="_self"><?php echo esc_html__( 'Read More', 'haru-formota' ); ?></a>
</div>
However you need add some CSS code to make it display fine.
Hope this help!
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HaruTheme