Since Markdown doesn't have any specific tag to specify the direction of [a given block of] a text, and since there are many cases in which the text body is mixed with RTL and LTR text, there is a need to detect the direction of the text automatically based on the context.

This feature is extremely need to be implemented in whatever possible way but the most feasible solution (as per my understanding) is to apply bidirection (bidi) to the render engine so it pass the responsibility of dealing with direction to the browser.