Hello!
"\XLite\View\ItemsList\Product\Customer\Category\M ain" is the base widget that renders the list of products from a category.
It has PARAM_CATEGORY_ID parameter, so I believe you can render it for a specific category from a template file (however, I'm not sure for 100% as it may take some parameters from the request and from the controller that handles the current "target").
The code could be as follows (I haven't tried it):
Code:
<widget class="XLite\View\ItemsList\Product\Customer\Category\Main" categoryid="YOUR_CATEGORY_ID" />