Register sidebar with extra fields?

I used this to register a new sidebar

// Adds Sidebar Widgets as a widget area
    if (function_exists('register_sidebar')) {
    	register_sidebar(array(
    		'name' => 'Sidebar Widgets',
    		'id'   => 'sidebar-widgets',
    		'description'   => 'These are widgets for the sidebar.',
    		'before_widget' => '<li class="widget_item"><div id="%1$s" class="widget %2$s">',
    		'after_widget'  => '</div></li>',
    		'before_title'  => '<p class="widget_title">',
    		'after_title'   => '</p>'

    	));
    }

I was wondering could I add more fields to it? I want
‘before_content’ and ‘after_content’ so I can style the content individually from the title. Is this possible? how can I achieve this?

Thanks WP community!