Hello
The documentation about JzCzHz (in LA : Local adjustments) seems to be quite complete, but the one about Cam16 was almost non-existent
This section added to Rawpedia, and translated by Wayne @Wayne_Sutton (thanks to him), is a solution to this lack.
https://rawpedia.rawtherapee.com/Local_Adjustments#Using_the_Cam16_and_HDR_functions
Jacques