This is the concept Boeing B777-8F. (Yes these are my designs, please use for inspirational purposes only, thank you)

Launch customer for this variant is unknown, although it may be Qatar Airways since they were interested in a 777-8 freighter variant. This is still a concept design however so there is no way of telling this will be a reality.
Update 1/31/2022 10:19:03 GMT: Boeing announced the launch of the 777-8F program, with the launch customer being non other than Qatar Airways. Qatar Airways also has 50 737 MAX 10s on order after Airbus cancelled 50 A321neo orders.

Specifications:
(Unknown Type Designator)
Length: 69.80 m
Wingspan: 71.75 m, 64.85 m folded
Height: 19.68 m
Fuel Capacity: 158,943 kg
Crew: 2
Engines: 2 x General Electric GE9X-105B1A

Potential orders:
- Qatar Airways