Custom Stepper with feedback in project tree

Hello,
I want to operate the OMP (oil metering pump) from an Rx7 FD. It is a stepper with a 5V feedback pin.
The stepper can do 200 steps. 0 steps are ~0.90 and 200 steps are ~4.40 volts. Any idea how to do this in the project tree in combination with the custom stepper function?