Add custom classes and extra divs inside the njk macro code

[kaynechu]

I was just wondering if there was a way to add custom li classes or extra divs for the child nav list?

So particularly for

<ul>
{%- for entry in navPages %}{{ renderNavListItem(entry) }}{%- endfor -%}
</ul>

Is there a way to extend this, so still generating the child nav links while being able to customise the code with extra html?