Change the asset path that Gitea uses when rendering Markdown

I have some Markdown files inside sub-directories on a local Gitea repository. They have image links pointing to some image files inside a top-level directory in the directory structure, something like /image/.

For example:

The Markdown link uses an absolute path. Something like ![](/image/image_file.png).

When rendered, the image link should look something like

http://domain.name/owner/repository/media/branch/master/image/image_file.png

However, Gitea looks in the Markdown’s own directory. The actual rendered link is something like

http://domain.name/owner/repository/media/branch/master/subdirectory/image/image_file.png

So the images do not load because the links do not point to the repository root, but to the current directory.

How can I change the asset path that Gitea uses when rendering Markdown?