markdown wont work inside the HTML tags but for just pure content in 2 columns there’s this code you can use. each column is represented by the +++
<div style="width: 100%;">
<!-- THE LEFT COLUMN -->
<div style="width: 48%; float: left; margin-right: 4%;">
+++
</div>
<!-- END THE LEFT COLUMN -->
<!-- THE RIGHT COLUMN -->
<div style="width: 48%; float: left;">
+++
</div>
<!-- END THE RIGHT COLUMN -->
</div>