Insert WP comments code to the 'tab' shortcode

Hi Vladimir and guys,

Please could you assist me with the following.
I’ve took your piece of code:

<?php
$my_tabs = '
[su_tabs]
   [su_tab title="TEST"] Some content [/su_tab]
   [su_tab title="TEST"] Some content [/su_tab]
   [su_tab title="TEST"] Some content [/su_tab]
[/su_tabs]
';
echo do_shortcode( $my_tabs );
?>

It works just fine.

But how could I insert the WP comments php code into one of tabs?

I’ve got it looking like this:

<?php comments_template('/comments.php',true); ?>

Thanks for this awesome plugin and your hard work!

https://wordpress.org/plugins/shortcodes-ultimate/