Priority and mask color edges on Toon shader/effect

Hi,

i can’t find a way to specify the toon edge priorities in solaris. What’s the process to do it in Houdini? I noticed that if i import usd shaded objects from maya i can override this parameter, so it exists somehow in houdini. But i can’t figure it out if i make a shader from scratch directly in houdini. I also tried to call the parameter by adding an attr to the toon effect node but without success.
Any idea on how to do that in houdini? Is this implemented? Same for mask color and mask color threshold.
Thanks,

Carine