Does it let you post content in markdown? This is important because to me a blog is just a place to publish my writings. I must be able to write somewhere else

Does it let you post content in markdown? This is important because to me a blog is just a place to publish my writings. I must be able to write somewhere else in my preferred format and just use the blog to publish it. As far as I can tell, wordpress only lets you write in their own wysiwyg editor, or plain html. Nothing else. So if I want to publish to it in markdown, I have to first export markdown to html separately.