To put it another way, it is impossible to do what an anamorphic lens does electronically.
An anamorphic lens changes the shape of the light coming out of the projector. With a 16:9 (1.78:1) projector, it will change the shape of the projected light from 1.78:1 to 2.37:1. Effectively it makes the projector a scope (2.37:1) projector.
This is a physical process, there is no way electronically to affect the shape of the light coming out of the projector.
And before anyone jumps on me, I'm talking very specifically about the function the lens actually performs, not how to achieve displaying scope content in general, there are several ways to display scope content, but there is only one way to actually change the shape of the projected light.