Gerbers are not source files, they are production files, more comparable to binaries.
I suggest you install the latest KiCAD version with appropriate plug-ins such as https://github.com/Bouni/kicad-jlcpcb-tools and https://github.com/matthewlai/JLCKicadTools (if you intend to use JLC for PCB manufacure and assembly, of course ) and make your own Gerbers from there.
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