looks like another undocumented feature. (-: Create a LAZ file with classified ground points (or only ground points) and use the option '-r discrete.laz' to add discrete LiDAR or otherwise extracted ground points that must be in the same geo-referencing
pulseview -i wameba\NP_T-356_FWF_809450_9717400_50.plz ^
then press <g> to only show those discrete returns classified as ground and press <t> to triangulate them..
Press <=> a couple of times to render the returns and the end-of-recording sample fatter. Hover over an end-of recording sample and press <i> to visualize a different pulse. Use the menu to show more than one pulse. Press <SHIFT>+<o> to suppress the rendering of the end-of recording samples (or the start-of-recording samples). Press <e> a few times to iterate through the rendering modes for the waveforms. Use the menu to also render the green pulses (connecting start-of-recording and end-of-recording samples) with green lines.
Some visuals are attached.