JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdn.ckeditor.com/4.5.9/standard/ckeditor.js"></script>
<textarea name="editor1">
    <table>
	<thead>
		<tr>
			<td>Column 1</td>
			<td>Column 2</td>
		</tr>
	</thead>
	<tbody>
    @foreach ($data as $datum)
		<tr>
			<td>{{ $datum->col1 }}</td>
			<td>{{ $datum->col2 }}</td>
		</tr>
		@endforeach
	</tbody>
</table>

<table>
	<thead>
		<tr>
			<td>Column 1</td>
			<td>Column 2</td>
		</tr>
	</thead>
	<tbody>
    @foreach ($data as $datum)
		<tr>
			<td>{{ $datum->col1 }}</td>
			<td>{{ $datum->col2 }}</td>
		</tr>
		@endforeach
	</tbody>
</table>

</textarea>

JavaScript

CKEDITOR.config.protectedSource.push( /@foreach.*/g );
CKEDITOR.config.protectedSource.push( /@endforeach.*/g );
CKEDITOR.config.protectedSource.push( /{{.*}}/g );

CKEDITOR.replace( 'editor1');