I should have been clearer. If you read my previous message you will see that I am not looking for what you are describing, rather the ability to read/write document and presentation files in markdown format.
This runs into the same problem -- a modern presentation program (such as LibreOffice's) is capable of recording many things in ODF files that can't be converted into markdown.
The nature of your problem is that you seek to go from a very capable modern format (such as ODF) to a simple format which, by design, can "only addresses issues that can be conveyed in plain text" (per https://daringfireball.net/projects/markdown/syntax).
The Multimarkdown editor supposedly can create OO files but since it does not run on my systems I have not been able to give it a try.
Going from markdown to ODF should be fine, going the other way is naturally going to be lossy.
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