Extracting of height atrribute

I extracted a canopy height model using TanDEM-X, what kind of height attributes can I extract? for example: using lidar we can extract p99, p95,… I just can extract the mean of DN pixel of CHM.
could you share your idea with me?

A height model is simply a raster. The only thing you can do is to calculate zonal statistics for polygons of different forest plots, for example the average height per defined area.

But SNAP cannot do that, you need to open the data in QGIS and use the Zonal Statistics Plugin, for example:

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