navigation - Counting Menu Items of the SubMenu in Typo3 -

i'm trying create nav in typo3, , need know number of items in submenu of current menu. don't see possibity in achieving this.

i know {register:count_menuitems}, doesn't help.

in first level of nav need number of items of second level put class of list (4 in example)

wrapitemandsub = <li class="dropdown mega-menu-4"> | </li> 

is worth trying or not possible?

thanks :)

example of nav:

#testmenu4 lib.testmenu4 = hmenu lib.testmenu4 { entrylevel = 0  1 = tmenu 1 {     expall = 1     wrap = <ul class="nav navbar-nav"> | </ul>     noblur = 1      no = 1     no {         wrapitemandsub = <li> | </li>         stdwrap.htmlspecialchars = 1         atagtitle.field = title     }      ifsub = 1     ifsub {         wrapitemandsub = <li class="dropdown mega-menu-4"> | </li>         wrapitemandsub.insertdata = 1         stdwrap.htmlspecialchars = 1         atagtitle.field = title         atagparams = class="dropdown-toggle" data-toggle="dropdown" aria-expanded="true"     }      act = 1     act <.no      actifsub = 1     actifsub <.ifsub }  2 = tmenu 2 <.1 2 {     expall = 1     wrap = <ul class="dropdown-menu"> | </ul>     no {             donotshowlink = 1         wrapitemandsub = <li class="one-column"> | </li>     }     ifsub = 0     actifsub = 0 }  3 = tmenu 3 <.2 3 {     expall = 1     wrap = <ul> | </ul>     no {         donotshowlink = 0         wrapitemandsub = <li class="nav-title"> | </li> |*| <li> | </li>     } } }