As long as it applies to the 777-300ER airframe.
The FCOM I have (-200) has the N1 settings for take off, climb, cruise N1 at various weights with expected fuel flow at power settings for LRC Mach etc etc.
Along with the unreliable airspeed section that gives an estimate of performance in climb, cruise, descent, and approach at various flap settings. Which all helps when making adjustments to the air file.
Acknowledging that in reality it’s probably not exact from the chart to aircraft anyway let alone to flight sim, so if I get reasonably close I’m satisfied.
So that’s kinda the minimum needed to get a pretty good FDE.