GitLab Wiki Editor for Markdown Files in Repository

Is it possible, to use the GitLab Wiki Editor for editing markdown files in the repository, when no repository wiki is created?

I know that the project wiki is a separat git repository. But it would be cool, if the wiki editor could be used for markdown files in the same repository.

Use Case:
We are using VuePress and running the GitLab Web IDE for uploading Images is to complicated for some users. A simple upload file button like in the wiki editor would simplify the process.