I knew that there is at least one Nightwatch light with build in USB-C charging, that I read about here on BLF, so I did a search and found it: [Review] Nightwatch Avaritia A54U - the world's brightest EDC flashlight!
There are a few people that have had issues with the onboard charging: [Review] Nightwatch Avaritia A54U - the world's brightest EDC flashlight! - #20 by cannga
But there are also a lot of people that don’t have any problems. Just check that topic to see all the different experiences.
I also took a look at Neal’s Gadgets website and I found out that the Nightwatch NG01 also has a USB port/charging, but only has 1 LED (with the SFN60.2 it says it reaches 7500 lumen).
There also is/was the NA40GT, which, according to the description, also had a USB-C charging port, but it is currently sold out and I have no clue if it will come back in stock.
So yeah, Nightwatch appears to have 2 lights with USB-C charging and certainly the A54U seems impressive, besides a few people had an issue with the charging.
EDIT: the NA54L (12000lm) also has a USB-C charging port. In the title description on Neal’s Gadgets it says 18650, but if you look at the product description on the page, it says 21700 and according to the photos, it absolutely looks like a 21700 battery tube.