Custom styles in TinyMCE – is it really this complicated?

I’d like to add a few custom styles to the standard list that appears on the second deck in TinyMCE (paragraph, pre, headings). I found this page: https://codex.www.ads-software.com/TinyMCE_Custom_Styles

But that seems terribly complicated.

Is there no simpler way to add a few custom div classes that users could select?

Thanks,

John