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>