How to add aria role and schema markup to custom walker container

@Dan meant this:

<nav role="navigation" itemscope="itemscope" itemtype="http://schema.org/SiteNavigationElement"><?php

    wp_nav_menu([
        'container'  => '',
        'items_wrap' => '<ul>%3$s</ul>',
        ...
    ]);

?></nav>

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