Move the "In this article" section to the side

In Microsoft Learn, most article have a "In this article" section at the top that serves as a table of content for that article. On longer articles, I find myself having to scroll up to the top to navigate to a different section, which can get quite annoying.

I'd like to see this section being placed in one of the sidebars so it is always accessible when reading the article. A great example of doing this is the new Wikipedia page layout where they have done exactly that.