How to fuse a rosbag's intensity into a PCD

When I try to map using rosbag, I want to be able to fuse intensity from LiDAR into a PCD so that I can recognize traffic lane lines of a PCD according to intensity.
In RViz, I could see intensity with different colors. But I couldn’t find intensity in a PCD.

This sounds like a generic question about the PCD format, you might get more responses if you ask the question here:
https://answers.ros.org/questions/

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