add_compatible_to_widget

/**
 * List JNews Widget Items
 */
add_action(
    'plugins_loaded',
    function() {
        if ( isset( $_GET['page'] ) && 'widget-importer-exporter' === $_GET['page'] ) {
            add_filter( 'jnews_load_register_widget', '__return_true' );
        }
    },
    1
);

/**
 * Import JNews Widget Areas
 */
add_filter(
    'wie_import_data',
    function( $value ) {
        $new_widget_area  = array_keys( get_object_vars( $value ) );
        $widget_area_key  = 'jnews-widget-list';
        $current_location = get_option( $widget_area_key );

        if ( is_array( $current_location ) ) {
            $new_location = array_merge( $current_location, $new_widget_area );
        } else {
            $new_location = $new_widget_area;
        }

        foreach ( $new_location as $widget ) {
            register_sidebar(
                array(
                    'id'            => sanitize_title( $widget ),
                    'name'          => $widget,
                    'before_widget' => '<div class="widget %2$s" id="%1$s">',
                    'before_title'  => '',
                    'after_title'   => '',
                    'after_widget'  => '</div>',
                )
            );
        }

        update_option( $widget_area_key, $new_location );

        return $value;
    }
);