I would like to create sliders such as the ones created in Contour Profiler platform:

I believe the Slider Bar used here is not documented because each row would need their own minimums and maximums and set value so I have no idea to achieve something like that with the documented Slider Box. I found a "Get N" function that returns the number of sliders in a slider box, but I cannot find any documentation for having multiple sliders in a slider box.
I tried to create journals from it but I could never get it to run as a piece of JSL code.
I like the fact that it has ranges and a set value in the middle. It also can create a mark in the middle for a reference value for example. I cannot build something like this from the usual Slider Box or Range Slider Box.
Has anyone managed to create such sliders using JSL?