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Code to be run at compile time

Is it possible to write some code (blueprint or c++, I don’t mind) that will run at compile time?
I want to automatically take some volume samples from the audio I have in game and store them in a lookup table for later use.
I know I could add this to be run at the start of the game each time, but it seems awfully wasteful given that the sound aren’t different each time you play.

Thanks,
Matt