I am using CKEditor for a forum. When I write something for example in bold and publish it, it is formatted via HTML tags:

<p><strong>Lorem ipsum</strong> dolor sit amet.</p>

I would rather like it to be formatted with Markdown:

Lorem ipsum dolor sit amet.

Here's my ckeditor setup, delivered via PHP:

<script src="//cdn.ckeditor.com/4.18.0/full/ckeditor.js"></script><!-- in head -->
...
<textarea id='editor1'></textarea>

<script>
    CKEDITOR.replace( 'editor1', {} );
</script>