How to add function output to wordpress menu properties?

Question

User navigation

Hello! There is a menu in wordpress in which I want to include the last item li in the result of displaying the value of the dynamic sidebar<?php dynamic_sidebar( "crypto_currency" ); ?>

<nav id="secondary-navigation" class="main-navigation secondary-navigation" role="navigation">
    <?php if ( has_nav_menu( 'secondary' ) ) {
            wp_nav_menu( array(
            'theme_location' => 'secondary',
            'items_wrap'      => '<ul id="%1$s" class="%2$s">%3$s</ul>';
                ) );
            } ?>
    <span><?php dynamic_sidebar( "crypto_currency" ); ?></span>
</nav><!-- .secondary-navigation -->

But, I can't include it in a wrapper and make everything appear on one line. In the first case, the ul list occupies the entire line and the span is already displayed on the second line. In the second case, I get a menu error, because. wp_nav_menu properties do not support dynamic php output and ul is not closing the way I would like (error in menu) Help me figure out how to fix this moment

<nav id="secondary-navigation" class="main-navigation secondary-navigation" role="navigation">
    <?php if ( has_nav_menu( 'secondary' ) ) {
        $items_wrap = 
        wp_nav_menu( array(
            'theme_location' => 'secondary',
            'items_wrap'      => '<ul id="%1$s" class="%2$s">%3$s</li>'+dynamic_sidebar( "crypto_currency" )+'</li></ul>'
        ) );
    } ?>
</nav><!-- .secondary-navigation -->

Answer 1

somehow so

add_filter( 'wp_nav_menu_items', 'wpp_add_menu_item', 10, 2 );
  function wpp_add_menu_item ( $items, $args ) {
    if ($args->theme_location == 'secondary') {
      ob_start();
      dynamic_sidebar( "crypto_currency" );
      $item = ob_get_clean();
      $items .= sprintf('<li>%s</li>',$item);
    }
    return $items;
  }