Nikolaj Schlej already has part 3 on his blog series on NVRAM formats in UEFI! Very long post with lot’s of information!
On NVRAM formats, part 3, about Phoenix SCT formats: FlashMap, EVSA, CMDB and some others common ones.
https://habrahabr.ru/post/281469/
https://firmwaresecurity.com/2016/04/13/nikolaj-on-nvram-formats-volume-2/
Also it appears he’s also released UEFITool NE alpha 25:
https://github.com/LongSoft/UEFITool/releases/tag/NE.A25