Fonts & Character Sets ⇒ Writing in Arabic in overleaf

[Eyal]

Hello,
I am using English as first language for my Thesis, however I need to use Arabic as well in some parts.
Is it possible to do that only in specific parts of the article? I tried using babel as follows:
usepackage[arabic,english]{babel} - so English is the last language (primary one).
and then where I tried to use Arabic I did the following:
\begin{otherlanguage}{arabic}
<Some Arabic text>
\end{otherlanguage}

And it did not work for me...
Do I need to set other settings?

BTW, I tried the following settings as well in my main document:
\usepackage[LFE,LAE]{fontenc}
\usepackage{arabtex}

Thanks