Stock kernel has F2FS built in! Possible to use it?

/proc/filesystems shows that the stock kernel of OOS has already the F2FS filesystem built in (by the way, also NTFS, which is useful for OTG...).

Now, the partitions are formatted with ext4... and F2FS has certain advantages (among them speed) over ext4...

So, would it be possible to format to F2FS in TWRP and then flash a stock ROM?