function add_last_step_field( $meta_fields ) {

    $meta_fields['course_last_step_title'] = array( 'label' => 'Course Last Step', 'type' => 'text', 'group' => 'other' );
    return $meta_fields;

}

add_filter( 'wpf_meta_fields', 'add_last_step_field' );


function sync_last_step_field( $data ) {

    $title = get_the_title( $data['lesson']->ID );

    wp_fusion()->user->push_user_meta( $data['user']->ID, array( 'course_last_step_title' => $title ) );

}

add_action( 'learndash_lesson_completed', 'sync_last_step_field', 2 );