I can't find the explanation of the parameters in msgconv config in the plugin manual

[sensor19]
enable=1
type=Camera
id=HWY_20_AND_LOCUST__HILL_EB_26-76__4_11_2018_4_59_59_433_AM_UTC-07_00
location=45.293701447;-75.8303914499;48.1557479338
description=Aisle Camera
coordinate=5.2;10.1;11.2

[place0]
enable=1
id=0
type=intersection/road
name=HWY_20_AND_LOCUST__EBA
location=30.32;-40.55;100.0
coordinate=1.0;2.0;3.0
place-sub-field1=C_127_158
place-sub-field2=Lane 1
place-sub-field3=P1

Where can I find the explanation of the above parameters?

Check https://docs.nvidia.com/metropolis/deepstream/plugin-manual/index.html#page/DeepStream%20Plugins%20Development%20Guide/deepstream_plugin_details.3.14.html#wwpID0E0OR0HA
Part Configuring Protocol Settings, a bit lower starting from line “The Kafka adapter lets you specify”