Select_Advanced Taxonomy

             array(
                    'name'    => __( 'Previous Exhibition', 'rwmb' ),
                    'id'      => "{$prefix}featured_slide_previous_exhibition_link",
                    'type'    => 'post',
                    'clone'    => false,           
                    'force_delete' => true,
                    'std'   => '',
                    'field_type' => 'select_advanced',
                    'query_args' => array(
                        'post_status' => 'publish',
                        'posts_per_page' => '-1',
                        'post_type' => 'exhibition',
                    ),
            
                ),

I'm Looking to display a custom post type called 'exhibition' with a select_advanced, this works fine as per above.

I'm running into problems to filter this list so that it only shows results for a taxonomy within exhibitions. In this case I want to just show the taxonomy 'type' with values of 'past'.

Any pointers would be greatly appreciated.