I’m in a similar position and figure that due to the beta nature of Paper 2D alongside the constant development, that the documentation as always will lag and we either choose to wait or get our hands dirty and adopt the try, learn, succeed approach.
I did notice Zak Parish mention in his lift video that the setup could be used in 3D as well and figure the reverse is likely true in many cases, with much of the blueprint / function info applying to Paper 2D.