The feature name of the marketplace version of pythonscripting is “marketplace-openhab-automation-pythonscripting”. It can also be deployed inside the addon folder.
The feature name of the official one is just “openhab-automation-pythonscripting”.
There is currently a limitation of the kar file bundle via addon folder. The Web UI based config is missing. You have to configure this binding via “/conf/services/pythonscripting.conf”. If I run the official add-on with the same codebase, the Web UI based config is visible.
I explored also the addon folder related code a bit and saw that not everything inside the kar file is parsed. e.g. the config.xml.