Is it possible to build something like this with a structure and the {% nav %} tag?

<nav class="navbar yamm navbar-default " role="navigation">
     <ul class="nav navbar-nav">
       <li class="dropdown">
         <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>
         <ul class="dropdown-menu">
           <li>
               <div class="yamm-content">
                  <div class="row"> 
                    ...
           </li>
         </ul>
       </li>
     </ul>
...
</nav>

Is it possible to build something like this with a structure and the {% nav %} tag?

     <ul class="nav navbar-nav">
       <li class="dropdown">
         <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown</a>
         <ul class="dropdown-menu">
           <li>
               <div class="yamm-content">
                  <div class="row"> 
                    ...
           </li>
         </ul>
       </li>
     </ul>

This is my code for now:

{% set entries = craft.entries.section('pagina') %}
   <ul class="nav navbar-nav">
      {% nav entry in entries %}
         <li {{ activeClass(entry.slug) }} {% if entry.hasDescendants() %}class="dropdown yamm-fw"{% endif %}>     
            <a href="#" {% if entry.hasDescendants() %}dropdown-toggle{% endif %}" {% if entry.hasDescendants() %}data-toggle="dropdown"{% endif %}>{{ entry.title }}</a>

            {% ifchildren %}
               <ul class="dropdown-menu">
                  {% children %}
               </ul>
            {% endifchildren %}
         </li>
      {% endnav %}
   </ul>

The problem is, i need custom html inside the children