php - Zend Framework 2: Composing web page of several parts

I need to compose a web page of several view templates (the view template rendering page content and a view template rendering sidebar). In my layout.phtml, I have two variable placeholders: $content and $sidebar:

......
<?php echo $this->sidebar; ?>
......
<?php echo $this->content; ?>
......
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In my controller's action, I pass the data to these view templates through the ViewModels chained in a tree:

public function indexAction() {

 // Preparing my data
 // $form = ...
 // $menuItems = 
 // $activeItem =       

 // Create sidebar view model
 $sidebarViewModel = new ViewModel(array('menuItems'=>$menuItems, 'activeItem'=>$activeItem));
 // Add it as a child to layout view model
 $this->layout()->addChild($sidebarViewModel, 'sidebar');

 // Page content view model
 $viewModel = new ViewModel(array('form'=>$form));
 return $viewModel;     
}
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But, because I have the sidebar on every page, I will have to copy and paste this code for every action of every controller. Is there any recommended way of reusing the code that populates the ViewModel for sidebar?