Strictly theoretically, I am no TWIG_er, in the
Product Image Swap XML Mod, it looks like this:
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<li><a class="img-zoom thumbnail" href="{{ popup }}" title="{{ heading_title }}"><img id="zoom_01" src="{{ thumb }}" data-zoom-image="{{ popup }}" title="{{ heading_title }}" alt="{{ heading_title }}" class="img-responsive img-center main_image" /></a></li>]]></add>
And something would have to placed like this, to add some Content below the image, as it looks, like:
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<li><a class="img-zoom thumbnail" href="{{ popup }}" title="{{ heading_title }}"><img id="zoom_01" src="{{ thumb }}" data-zoom-image="{{ popup }}" title="{{ heading_title }}" alt="{{ heading_title }}" class="img-responsive img-center main_image" /></a></li>
H E R E ! Sample: <li><a class="thumbnail">{{ description }}</li>
</add>
EITHER: ( shown by use of the Product Description Variable )
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<li><a class="thumbnail">{{ description }}</li>
OR:
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<div class="thumbnail"">{{ description }}</div>
The 'Class THUMBNAIL Section' would probably be usable, or then, use another one, to make it look good.
Just to give you some idea. But if you like to place some CUSTOM (Variable) Content, NOT defined/declared
in the PRODUCT-related controller/model/language Pages already, it would not work, without rewriting the
ADMIN and FRONT Side Sections accordingly, to individually add some specific 'Value-Variable' per Image.
And this would be a DEV-Job, to achieve, what you're looking for!
Good Luck!
Ernie
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Mod mentioned above:
Product Image Swap
https://www.opencart.com/index.php?rout ... n_id=36959