Jira Cloud plugin for Markup Language Conversion

Jira dont understand markdown by default. but user often copy markdown text from github in jira tickets (descriptions and posts) and then we see only plain markdown text and not a well structured, human good readable text. here I give you a good example. on the left hand side it is markdown. and on the other side is the output, what we want to see as human. [login to view URL] we need a plugin. When user write markdown and click on save. saved version in JIRA will be human readable well structured. when user re edit, he see again the markdown. can edit and after save he see again the well strucured markdown. I need for description and comment field.