Sure, it’s pretty easy. I just downloaded the diagnostic file from the ZHA integration, which you can do here:
This will initiate the download of a file that you can edit in your default editor. Scroll down until you see “energy_scan” at the end:
These are the values for all channels. I just did this 10 times and copied all the values into an Excel document, which you can use to create the graphs. Of course you don’t need them, the numbers themselves are enough to estimate which channel might work.