1) Open this file: content-single-product.php
Locate these:
<?php if ($product_short_description != "") { ?>
<div class="product-short">
<?php echo do_shortcode($product_short_description); ?>
</div>
<?php } else { ?>
<div class="product-short">
<?php echo apply_filters( 'woocommerce_short_description', $post->post_excerpt ); ?>
</div>
<?php } ?>
and change to this:
<?php if ($product_short_description != "") { ?>
<div class="product-short" itemprop="description">
<?php echo do_shortcode($product_short_description); ?>
</div>
<?php } else { ?>
<div class="product-short" itemprop="description">
<?php echo apply_filters( 'woocommerce_short_description', $post->post_excerpt ); ?>
</div>
<?php } ?>
2) If you disclose all the changes you have made, then a developer can help you keep updated with the latest theme changes. Something like this would still require time and is not a copy/paste quick job as such.
Hope that helps!