I am working on a wordpress website and i am little stuck into one situation, what i want is that to add multiple and dynamic slug values from job listing taxonomy, right now i have to manually insert the slug name into 'option_none_value' => '', if no category is selected. I searched a lot on google but didn't find any relevant solution.

wp_dropdown_categories( 
    array(
        'show_option_none'   => 'All Job-types',
        'option_none_value'  => '',
        'value_field'       => 'slug',
        'taxonomy'          => 'job_listing_type',
        'name'              => 'search_type',
        'orderby'           => 'name',
        'class'             => 'select-on-home',
        'hierarchical'      => true,
        'hide_empty'        => true ,
        'show_option_all'   => esc_html__('','workscout'),
        'echo' => 0
    )
);