In-Depth Articles on posts

Hi

I have been trying to find a way to add an in-depth article to my site and I am having a really hard time figuring out how to create one.

From what I have gathered I need to use the schema markup, but I can’t seem to find an example of how to do it on a WordPress site.

There seems to be only a handful of plugins, all which seem to have issues with them.

Can someone please point me into the right direction of how to create an in-depth article on a wordpress post?