I’m not sure that’s the way to view it. The amount of fuel injected would be proportional to the amount of power requested by the operator/throttle. The amount of air packed into the cylinder would vary based upon the speed developed by the engine which, in-turn, pushes exhaust gases out to drive the turbo. So increased fuel injected will produce increased turbo-power resulting in increased air sufficient to match up with the amount of fuel. (Often evidenced by that little black “puff” which occurs when the throttle is first jammed further-open…and which clears up as addt’l air is pumped into the cyl by the turbo.)That would be true for a spark engine where a stochiometric mixture is needed. But a diesel only injects the fuel it needs, usually running lean.