Paste and edit Markdown into PR description

[Thomas Nabelek]

I am coming from GitLab which as the option on merge requests to switch the description editor between Rich text and Markdown. I prefer to type things up in Markdown, and sometimes do it elsewhere and then copy and paste into the description. There seems to me no way to do this in Bitbucket Cloud. If I do `ctrl+v`, Bitbucket automatically inserts a code block and puts the Markdown in that as code. If I do `ctrl+shift+v`, the Markdown just gets pasted as regular text.

I know that I can use Markdown as I type and it will format as I go, but this is not what I am looking for. I need the ability to edit raw Markdown.