Currently we have a %render magic to process whatever output from a cell in markdown or other formats. This is a powerful mechanism but it is complicated if you just want to enter some markdown.

A markdown kernel is a bad idea because there are already markdown cells that are handled by Jupyter, and there is no concept of variable etc in markdown. However, with SoS, a markdown kernel can be useful with something like

%expand
* This is result whatever {result}

Basically, the %expand magic would make the kernel useful in an SoS environment.