Custom LaTeX macros and newcommands

Yes, you can specify your favorite macros and add your favorite packages (this is a list of LaTeX packages we support)

In Edit mode, click on Edit Macros in the toolbar, under Settings ⚙️

Macros

\newcommand{\msun}{\,\mathrm{M}_\odot}

and then go back to your article and write in a LaTeX block Hello $\msun$, you will generate “Hello M⊙”.

Packages
\usepackage{siunitx}
\corraddress{Author One PhD, Department, Institution, City, State or Province, Postal Code, Country}