This plugin will actively export your data to Ghost JSON structure. You can use it to export your data from Pelican to Ghost.
git clone git@github.com:allenskd/pelican2ghost.git
Open your pelicanconf.py and add
PLUGIN_PATHS = ['/my/base/path']
PLUGINS = ['pelican2ghost']
You can run ./develop_server.sh start (or restart) multiple times. The data dump will be generated in your pelican folder /path/to/your/website/folder/ghost_export. A file called pelican2ghost.json will be there.
This exporter does not support exporting tags, only categories for the time being. Feel free to submit pull requests if you have worked on a solution for it. This also doesn't export Pages, only articles.