I'm not sure how this feature is called, but in Org you can restrict a line to a given exporter by prepending it with, eg, #+latex:
There's a bug with some exporters f treat these lines as paragraph breaks,
some don't. For example, the following input:
Hello
#+latex: \TeX{}
World
#+html: Wide Web
!
Is exported to LaTeX as a single line, "Hello TeX World !", but to HTML
as separate paragraphs:
<p>
Hello
</p>
<p>
World
</p>
Wide Web
<p>
!
</p>
I wouldn't except these lines to introduce any paragraphs break.
This is with Emacs built from Git, using Org 9.2.6.
Best regards,
Thibault
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