Shopp Display Variations Title and Add-ons Title Above each Selector

I am modifying my product.php page to display variations in a radio button format, and to show add-ons as checkbox selectors. I am using a child page. So far things are fine. However, I cannot figure out how to show a Variable Label over each set of variables (such as Battery Size for choosing a variable battery size), or how to show a label above the Add-Ons (such as “Additional Features” for my price-added options.

Here’s the code I have for these two items:

<table style="width:90%; border:0px; padding:5px;"><tbody><tr><td>
<?php if ( shopp('product','has-variants') ): ?>
    <ul class="variants">
    <?php while ( shopp('product', 'variants') ): ?>
    <li><label><?php shopp('product','addon','input=radio'); ?>&mdash;&nbsp;<?php shopp('product','addon','label=on'); ?></label></li>
    <?php endwhile; ?>
    </ul>
<?php endif; ?>
</td><td>
<?php if ( shopp('product','has-addons') ): ?>
    <ul class="addons">
    <?php while ( shopp('product', 'addons') ): ?>
    <li><label><?php shopp('product','addon','input=checkbox'); ?>&mdash;&nbsp;<?php shopp('product','addon','label=on'); ?></label></li>
    <?php endwhile; ?>
    </ul>
</td></tr></tbody></table>

I just want to add the corresponding title to each loop of variables or add-ons. Any help is welcome. Thanks in advance!

https://wordpress.org/plugins/shopp/