Structured Data Markup

Anyone have an idea of how to add Microdata to a WordPress page or post? I have tried pasting the example JSON-LD markup created using googles Structured Data Markup Helper and pasted the generated code directly into a WordPress page and saved while in the text mode of the editor.

I have used the Structured Data Testing Tool on the URl to see if any of the microdata code that I added shows up and it doesn’t.

I’m not trying to use a plugin that generates a rate box or something thing along those lines.