Do you mean extract from the update.app? I use a perl script for that. Works in Linux/Mac. In Mac OS, it doesn't check the CRC, but it works anywayUnfortunately, Luk1337 has rebased his repo for EMUI 9 vendor and now I have lost the NFC config, so I have to extract them asap when I'm on Windows with the update extractor.
Also, those builds will be seperately maintained and not be officially available on the PixelExperience website.