I added below code in wordpress to add new taxonomy in post. But I don't know how to show new taxonomy on post grid widget. I founded {{putPostTags(item.post_list.id)}} but I don't know how to change to use it.

function custom_taxonomy() {
    /* $label contains parameters determining the Taxonomy’s display name
    */
    $labels = array(
        'name' => 'Expert',
        'singular' => 'Expert',
        'menu_name' => 'Expert'
    );
    /* $args declares various parameters in the custom taxonomy
    */
    $args = array(
        'labels' => $labels,
        'hierarchical' => false,
        'public' => true,
        'show_ui' => true,
        'show_admin_column' => true,
        'show_in_nav_menus' => true,
        'show_tagcloud' => true,
'rewrite'  => array( 'slug' => 'expert' ),
    );
    /* register_taxonomy() to register taxonomy
    */
    register_taxonomy('expert', 'post', $args);
}
// Hook into the 'init' action
add_action( 'init', 'custom_taxonomy', 0 );

I used {{putPostTags(item.post_list.id)}} but this function show only default tags but how show my new taxonomy whitch has name Expert?

Thanks for help, Your suggested give me solution which works.