How to output a comment with ReactJS

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Javascript

Knockout.js

ReactJS

I am trying to improve some knockout code I have with JSX, defining the template inline with JSX.
I would like to output HTML comment, as in:

<tr data-bind="foreach: columns">
<th data-bind="css: { hidden: !visible() }">
	<!-- ko if: header -->
	<span data-bind="text: header"></span>
	<!-- /ko -->
</th>
</tr>

This won't pass JSX compilation, I am trying to replace the comments with a react class <KOComment text="if: header">somethings</KOComment>
where KOComment with output the knockout comment directive.

Any clue how to create a comment HTML element with React?