How to get image URL for a product in Zoho Books/Inventory through a function?

How to get image URL for a product in Zoho Books/Inventory through a function?

Hello,

I retrieve products from Zoho Books to display them in Zoho Sites. Is use the new dynamic content feature.

Function to retrieve products:

resp = zoho.books.getRecords("Items","XXX");
return resp.get('items').toJSONList();

In HTML I loop through this list and display the products:

{% resp = functions.execute("get_products") %} 
{% for item in resp %}
<div class="product">
    <img class="product-image" src="{{ item.image_name }}">
    <div class="product-details">
        <a href="#">
            <h3>{{ item.item_name }}</h3>
        </a>
    </div>
</div>
{% endfor %}

However the image cannot be displayed. Per product there are following image related attributes:

"image_name":"abb-b23-212-100.png",
"image_type":"png",
"image_document_id":"133014000000115186"

How can I construct a correct image URL from this?

Sunny regards,
Artjom