Add a Button that calls the Listing owner

functions.php

function custom_listify_single_job_listing_actions_after() {
    global $post;
    
    $phone = get_post_meta( $post->ID, '_phone', true );
    
    echo '<a href="tel:' . $phone . '" class="button">My Button</a>';
}
add_filter( 'listify_single_job_listing_actions_after', 'custom_listify_single_job_listing_actions_after' );