How to manipulate sidebar by JavaScript

[Stefan Mueller]

Can I use JavaScript in the sidebar?

When I read

1. Modifying content of page tree in sidebar
2. The Safest Way To Inject CSS/HTML/Javascript to Confluence Pages
3. How do i customize my confluence side bar?
4. HipChat sidebar
5. Implementing Custom Sidebar with Atlaskit in Atlassian Server Plugin
6. How to hide elements in Confluence using CSS or JavaScript
7. How can I hide the left sidebar on some pages when using the Documentation theme?
8. How can I always show the left sidebar on some pages when using the Documentation theme?
9. How to use JavaScript in Confluence
10. Navigation Link Macro for Confluence

It looks like I cannot do it. It supports only Wiki Markup, macro calls and working with selectors. There might be an option using the HTML MAcro, according to Unknown Macro: html when used in Sidebar.

So can I use the HTML Macro to manipulate the sidebar?
I found some code examples in Creating a Custom Page Tree macro.

I want to create a page tree as done by the Page Tree Macro but filter pages based on page labels. There is a similar question but it is unsolved: Confluence: Is there a Page Tree macro which uses labels as a filter