The tab content for a tab is inserted via tinymce editor which supports shortcodes of all kinds. You can use a plugin like Shortcodes Ultimate to insert shortcodes.
Having said that, I see there is a problem in the code which makes the shortcodes to be ignored and printed as is without processing. To fix the same, pls go to file <plugin folder>/includes/addons/tabs/class-lvca-tabs.php file and change line number 216 from –
wp_kses_post($content)
to
do_shortcode($content)
This would make the shortcodes inserted into tab content to be processed on the frontend. Have made sure this change to be part of the next update so that you do not lose the same on plugin updates. Thanks for bringing this to my attention.