I figured it out! Go to this file:
wp-content/themes/virtue/woocommerce/single-product/meta.php
and find this code:
<?php do_action( 'woocommerce_product_meta_start' ); ?>
After that line, add this code:
`<?php if ( wc_product_sku_enabled() && ( $product->get_sku() || $product->is_type( ‘variable’ ) ) ) : ?>
<span class=”sku_wrapper”><?php _e( ‘SKU:’, ‘woocommerce’ ); ?> <span class=”sku” itemprop=”sku”><?php echo ( $sku = $product->get_sku() ) ? $sku : __( ‘n/a’, ‘woocommerce’ ); ?></span>.</span>
<?php endif; ?>`
You may want to do this in a child theme or save it in another file, because it will get deleted with an update. But, maybe they will update the file to have this code anyway…