How to make a tree container?

Please tell me how I can make a page similar to the Autodesk 3ds max documentation page?

I want to make the documentation for another program as similar as possible as in the example. The page is divided into 2 parts. In the left part of the tree container. In the right part of the content.

I think the way to do it is through a custom element where you use html, css & Javascript to create this menu.
But it’s more advanced coding than the regular Wix UI (you should know how to use htm, css and to google it).

About Custom Elements:
https://support.wix.com/en/article/velo-about-custom-elements
https://www.wix.com/velo/reference/$w/customelement

Tree Menu examples on Code Pen:

https://codepen.io/Saminou24/pen/vOEzxE

More examples:

https://code-boxx.com/css-collapsible-tree-menu/
https://iamkate.com/code/tree-views/