How to use the Omnigraph of Print RTX Lidar Print Info Node(Isaac Print RTX Sensor Info)

Omniverse Isaac Sim
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I tried for a long time, but I couldn’t successfully use the Print RTX Lidar Print Info Node or new version named Isaac Print RTX Sensor Info Omnigraph. I think the root cause is that I don’t know how to pass the correct data to the RTX sensor render result
These are the two Omnigraphs I tried, and I couldn’t get the Sensor Info.
I don’t understand what a render result is and where to get it.

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Looking forward to any useful help. Thanks!

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When the program is running, SdRenderVarPtr appears. Adding the isaac_print_rtx_sensor_info node to the back can successfully print out the lidar log data.
However, apart from this method, SdRenderVarPtr cannot be found at all. Why is that?