[chimerax-users] Developing a ChimeraX bundle - accessing programmatically ChimeraX(GUI open) session

Hello, I would like to develop a small bundle-plugin for automatically annotating residue labels in protein structures. I tried to access ChimeraX via command line when ChimeraX was running (GUI open) with an opened protein structure in order to study the structure objects hierarchy( chain ->residue ->atoms). This would help me understand it better and code accordingly. Unfortunately, I didn’t manage to do so. Could you please suggest me a way, a page or terminal where I could read more about the internal structure of ChimeraX and if possible to programmatically access a session when it’s running in ChimeraX. Kind regards, Stel Iliadis