Hi, automatic properties definitions in property set definitions you can create with sample Dynamo graphs installed with Dynamo.
Go to this folder C:\ProgramData\Autodesk\C3D 2023\Dynamo\samples\Data\AutoCAD\pset
Open pset_utils.py
You can get inspiration from Paolo Emilio Serra code and function create_ps_definitions_json.
Example here:
for jpd in jpsd.Definitions:
pd = PropertyDefinition()
pd.Automatic = jpd.Automatic
pd.DataType = DataType.Parse(DataType, jpd.DataType, True)