The user community does that. A small team of volunteers then approves any changes.
I stand corrected. It is exported to the binding. i found it under a different filename than I was expecting.
I am not familiar with HABPanel but openHAB controls Items linked to Thing channels. It does not control Thing channels directly.
Please post any relevant parts of your configuration using cide fences.
How to use code fences - Tutorials & Examples - openHAB Community