I just want to draw your attention that both web pages for checking the JSON and Python API documentation are lacking usability.
The left column to check for the different types, classes and etc, can't be readjusted, nor does it have a horizontal bar to have a glimpse of what it does contain.
By the way, do you know that there are free per-configured webpages for this type of APIs documentation for FREE, one of them is called "Read the Docs" https://readthedocs.org/
Please, fix it
Or you can see this suggestion: https://community.Graphisoft.com/t5/Wishes-forum/Archicad-JSON-amp-Python-APIs-needs-fixing/m-p/3666...
A good friend of mine have once told me that I´m so brute that I´m capable of creating a GDL script capable of creating GDLs.