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I've just come across this question, while doing the same thing myself. So just in case anyone else finds this question I'll describe the solution.

If you need a point cloud to represent some custom point type beyond the standard options built into PCL (XYZ, XYZRGB, XYZI, etc) You have to define a custom PCL point type with the same behaviours as the built in types. Luckily there is a good tutorial showing you how to do this here:

PCL Custom Point Type Tutorial

If you follow this fairly straightforward tutorial then create and publish a point cloud with this new type this it will be shown in RVIZ fine including a drop down of the addition variables which are now stored for your custom point type.