Simple chemical notation
For simple chemical notation, you can using the via the x^2y button in the toolbar. All details here.

More complex chemical notation
Go to your article's Data folder from the toolbar and add a file called header.tex with the following line in it:


Then, go back to the article view, insert a LaTeX snippet and type some chemical formulae, for example:
$\chem{H_2} + (1/2)\,\chem{O_2} = \chem{H_2O}$

will produce:


will produce:

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