is it possible to put values from settings page to function register_widget()?

$bootstrap_classes is a bunch of bootstrap classes (that I get form mb settings page through the function prefix_mega_menu_widget_classes()). I want to insert into 'before widget' but it doesn't work (it returns null). But when I try to print it out into a page, it works properly.

I think, because widget init is prioritized, it runs before the setting function so the setting function (which I call in widget init function) returns null value.

Could you help me, please! Thanks in advance <3

function prefix_mega_menu_widget_classes() {
$option_name = 'prefix_options'; // update option_name
		$columns = rwmb_meta( 'mega-menu-columns', array( 'object_type' => 'setting' ), $option_name );
	if ( '4' === $columns ) {
		$classes = 'col-xl-3 col-lg-4 col-md-6';
	} elseif ( '3' === $columns ) {
		$classes = 'col-lg-4 col-md-6';
	} else {
		$classes = 'col-md-6';
	}

	return $classes;
}

function prefix_init_mega_menu_widgets() {
	$location  = 'mega-menu';
	$css_class = 'has-mega-menu';
	$locations = get_nav_menu_locations();
	if ( isset( $locations[ $location ] ) ) {
		$menu = get_term( $locations[ $location ], 'nav_menu' );
		if ( $items = wp_get_nav_menu_items( $menu->name ) ) {
			foreach ( $items as $item ) {
				if ( in_array( $css_class, $item->classes ) ) {

					$bootstrap_classes = prefix_mega_menu_widget_classes();

					register_sidebar( array(
						'id'            => 'mega-menu-widget-area-' . $item->ID,
						'name'          => $item->title . ' - Mega Menu',
						'before_widget' => '',
						'after_widget'  => '',
						'before_title'  => '<h3>',
						'after_title'   => '</h3>',
					) );
				}
			}
		}
	}
}
add_action( 'widgets_init', 'prefix_init_mega_menu_widgets' );