Render a widgetkit inside a category description

-- HikaShop version -- : 2.3.4
-- Joomla version -- : 3.3.6

Have a custom field for categories named widgetkit_id

have a category view with an associated module for products (of that category)

I want the template to show data in the description and after to compose a widgetkit gallery by using shortcode formula this way:

echo '[widgetkit id='.$widgetkit_id.']'

What I get rendered is the sentence in text for reading [widgetkit id=1] instead of the widgetkit getting executed as would happen with a Joomla Content Article.

How should I code this?

Ans how should I grab the value of the custom field?

FOUND IT! SOLVED!

Posting in the hope is useful to somebody. By analyzing the widgekit_content.php plugin file I got the needed code:

<?php					
$widget_id = $this->element->widgekit_id;   // RETRIEVES THE VALUE FOR THE WIDGETKIT ID form custom field in category
			
// load widgetkit
require_once(JPATH_ADMINISTRATOR.'/components/com_widgetkit/widgetkit.php');	

// render output
$output = $widgetkit['widget']->render($widget_id);
$output = ($output === false) ? "Could not load widget with the id $widget_id." : $output;
?>

if($this->params->get('show_description',1)&&!empty($this->element->category_description)){