How are the members of Process Environment Block Initialized?

I'm looking to learn how the NLS data of a process is initialized in the PEB structure. Specifically the members AnsiCodePageData, OemCodePageData and UnicodeCaseTableData. I suspect that the CmpFindNlsData of Winload is responsible for populating these but I'm missing the link from initializing strings in CmpFindNlsData to populating them in PEB of each process.

dt _PEB 002b0000
ntdll!_PEB
   +0x000 InheritedAddressSpace : 0 ''
   +0x001 ReadImageFileExecOptions : 0 ''
   +0x002 BeingDebugged    : 0x1 ''
   +0x003 BitField         : 0 ''
   +0x003 ImageUsesLargePages : 0y0
   +0x003 IsProtectedProcess : 0y0
   +0x003 IsImageDynamicallyRelocated : 0y0
   +0x003 SkipPatchingUser32Forwarders : 0y0
   +0x003 IsPackagedProcess : 0y0
   +0x003 IsAppContainer   : 0y0
   +0x003 IsProtectedProcessLight : 0y0
   +0x003 IsLongPathAwareProcess : 0y0
   +0x004 Mutant           : 0xffffffff Void
   +0x008 ImageBaseAddress : 0x66200000 Void
   +0x00c Ldr              : 0x7753cb80 _PEB_LDR_DATA
   +0x010 ProcessParameters : 0x00441d18 _RTL_USER_PROCESS_PARAMETERS
   +0x014 SubSystemData    : (null) 
   +0x018 ProcessHeap      : 0x00440000 Void
   +0x01c FastPebLock      : 0x7753c940 _RTL_CRITICAL_SECTION
   +0x020 AtlThunkSListPtr : (null) 
   +0x024 IFEOKey          : (null) 
   +0x028 CrossProcessFlags : 2
   +0x028 ProcessInJob     : 0y0
   +0x028 ProcessInitializing : 0y1
   +0x028 ProcessUsingVEH  : 0y0
   +0x028 ProcessUsingVCH  : 0y0
   +0x028 ProcessUsingFTH  : 0y0
   +0x028 ProcessPreviouslyThrottled : 0y0
   +0x028 ProcessCurrentlyThrottled : 0y0
   +0x028 ProcessImagesHotPatched : 0y0
   +0x028 ReservedBits0    : 0y000000000000000000000000 (0)
   +0x02c KernelCallbackTable : (null) 
   +0x02c UserSharedInfoPtr : (null) 
   +0x030 SystemReserved   : 0
   +0x034 AtlThunkSListPtr32 : (null) 
   +0x038 ApiSetMap        : 0x00030000 Void
   +0x03c TlsExpansionCounter : 0
   +0x040 TlsBitmap        : 0x7753cb28 Void
   +0x044 TlsBitmapBits    : [2] 0x10001
   +0x04c ReadOnlySharedMemoryBase : 0x7fe80000 Void
   +0x050 SharedData       : (null) 
   +0x054 ReadOnlyStaticServerData : 0x7fe804b0  -> (null) 
   +0x058 AnsiCodePageData : 0x7ffb0000 Void
   +0x05c OemCodePageData  : 0x7ffc0224 Void
   +0x060 UnicodeCaseTableData : 0x7ffd0648 Void
   +0x064 NumberOfProcessors : 2
   +0x068 NtGlobalFlag     : 0x70
   +0x070 CriticalSectionTimeout : _LARGE_INTEGER 0xffffe86d`079b8000
   +0x078 HeapSegmentReserve : 0x100000
   +0x07c HeapSegmentCommit : 0x2000
   +0x080 HeapDeCommitTotalFreeThreshold : 0x10000
   +0x084 HeapDeCommitFreeBlockThreshold : 0x1000
   +0x088 NumberOfHeaps    : 2
   +0x08c MaximumNumberOfHeaps : 0x10
   +0x090 ProcessHeaps     : 0x7753b6c0  -> 0x00440000 Void
   +0x094 GdiSharedHandleTable : (null) 
   +0x098 ProcessStarterHelper : (null) 
   +0x09c GdiDCAttributeList : 0
   +0x0a0 LoaderLock       : 0x7753a378 _RTL_CRITICAL_SECTION
   +0x0a4 OSMajorVersion   : 0xa
   +0x0a8 OSMinorVersion   : 0
   +0x0ac OSBuildNumber    : 0x47bb
   +0x0ae OSCSDVersion     : 0
   +0x0b0 OSPlatformId     : 2
   +0x0b4 ImageSubsystem   : 3
   +0x0b8 ImageSubsystemMajorVersion : 6
   +0x0bc ImageSubsystemMinorVersion : 0
   +0x0c0 ActiveProcessAffinityMask : 3
   +0x0c4 GdiHandleBuffer  : [34] 0
   +0x14c PostProcessInitRoutine : (null) 
   +0x150 TlsExpansionBitmap : 0x7753cb18 Void
   +0x154 TlsExpansionBitmapBits : [32] 1
   +0x1d4 SessionId        : 1
   +0x1d8 AppCompatFlags   : _ULARGE_INTEGER 0x0
   +0x1e0 AppCompatFlagsUser : _ULARGE_INTEGER 0x0
   +0x1e8 pShimData        : 0x00160000 Void
   +0x1ec AppCompatInfo    : (null) 
   +0x1f0 CSDVersion       : _UNICODE_STRING ""
   +0x1f8 ActivationContextData : (null) 
   +0x1fc ProcessAssemblyStorageMap : (null) 
   +0x200 SystemDefaultActivationContextData : 0x00150000 _ACTIVATION_CONTEXT_DATA
   +0x204 SystemAssemblyStorageMap : (null) 
   +0x208 MinimumStackCommit : 0
   +0x20c SparePointers    : [4] (null) 
   +0x21c SpareUlongs      : [5] 0
   +0x230 WerRegistrationData : (null) 
   +0x234 WerShipAssertPtr : (null) 
   +0x238 pUnused          : (null) 
   +0x23c pImageHeaderHash : (null) 
   +0x240 TracingFlags     : 0
   +0x240 HeapTracingEnabled : 0y0
   +0x240 CritSecTracingEnabled : 0y0
   +0x240 LibLoaderTracingEnabled : 0y0
   +0x240 SpareTracingBits : 0y00000000000000000000000000000 (0)
   +0x248 CsrServerReadOnlySharedMemoryBase : 0x7fbe0000
   +0x250 TppWorkerpListLock : 0
   +0x254 TppWorkerpList   : _LIST_ENTRY [ 0x2b0254 - 0x2b0254 ]
   +0x25c WaitOnAddressHashTable : [128] (null) 
   +0x45c TelemetryCoverageHeader : (null) 
   +0x460 CloudFileFlags   : 0
   +0x464 CloudFileDiagFlags : 0
   +0x468 PlaceholderCompatibilityMode : 0 ''
   +0x469 PlaceholderCompatibilityModeReserved : [7]  ""
   +0x470 LeapSecondData   : 0x7ffa0000 _LEAP_SECOND_DATA
   +0x474 LeapSecondFlags  : 0
   +0x474 SixtySecondEnabled : 0y0
   +0x474 Reserved         : 0y0000000000000000000000000000000 (0)
   +0x478 NtGlobalFlag2    : 0