You can add custom code or wrappers before componentz header wrapper.

Example of adding custom wrapper with content before componentz header wrapper:

add_action( 'componentz/theme/before_header_wrapper', 'my_custom_wrapper' );

 * My Custom Wrapper
function my_custom_wrapper() {
	echo '<div class="my-custom-wrapper">';
  		echo esc_html__( 'My Custom Content', 'textdomain' );
  	echo '</div>';

The above code will produce next HTML structure:

<!DOCTYPE html>
    <title>Page title</title>
    <div id="componentz-wrapper">
      <!-- Your Custom Wrapper -->
      <div class="my-custom-wrapper">
        My Custom Content
      </div><!-- Your Custom Wrapper End -->
      <header id="componentz-header">
      <main id="content" class="site-content" role="main">
      <footer id="componentz-footer">