shortcode to display the categories

The shortcode doesn’t support a way to display categories. The category ID (term_taxonomy_id) is used to only limit posts to a particular category.

To display categories you’ll need to write custom code.

See an example of my other plugin: https://github.com/WebberZone/code-library/blob/master/top-10/outputs/tptn-add-categories.php

But you’ll need to use this filter: crp_after_list_item