Usually it's better to submit something more specific. I prefer a blog post. You previously submitted https://meta.ga/ It looks nice. Some ideas:

Try to write a blog post about it. What is the technology stack? Which markdown versions does it support? Can you make a github flavored version? Pastebin? What are the problems you had writing it? Can you add some UI buttons like italics, bold, ...?

Can you add an initial example? Perhaps make a link from the blog post to an editable version of it.

If you made this and you want feedback and reply question, try reading the rules of "Show HN:" https://news.ycombinator.com/show