It can be usefull mostly for ML features like RAW video, dual ISO, full size silent pictures etc.
No one of them were implemented in CHDK.
Haven't looked at how this might apply to P&S, but the ones with Canon raw likely have something equivalent.
and their firmwares happen to have a lot more useful annotations and test functions
Your firmware(SX280_102b) also has "annotations" (see function 0xFC29DD36) in test functions(see list at 0xFC93B650)
finding similarities in code, using the info found on the ML site (and their source).
To make it usefull on P&S cameras we need to find equivalent of "FA_CreateTestImage" function from DSLR.On your G7X_100d look at 0xFCD4609C.
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