How to check markdown at extensions

How do I...?
#1

I made an extension and I want to check how the description will look like after I added markdowns to it, but I could not find any way to do, since clicking on the extension opens the editor directly.

Edit: I think I should have posted this at the forums “Extension” category but its too late

#2

You can use any markdown renderer, there are hundreds if you search for it on google.