Where can I retrieve how are serialized replaydata in Fortnite *.replay file (in unreal engine source files)

Development Programming & Scripting C++
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Hi, I was able to retrieve high-level serialization of a replay file taken from Fortnite, like magic number, timestamp, etc.
I’m able to retrieve chunks (event, replayData), decrypt them, decompress them (LocalFileNetworkReplayStreaming) but I’m now stuck.
Where can I found the serialization process of those chunks in unreal engine source file? I am very lost…

Thanks a lot for any help.