I would expect it to be somewhat noisy and that you would have to do some software smoothing of sensor values if you wanted to improve the accuracy of the pressure measurement. But perhaps you don’t need that much accuracy. I know that Adafruit has some tutorials on using soft circuits as sensors. Like this one https://learn.adafruit.com/firewalker-led-sneakers/test-circuit.
In their example they use velostat as a trigger on an analog pin. That pin is set up as part of a voltage divider created between an internal pull-up on A9 ( pinMode(9, INPUT_PULLUP); ) and the potentiometer created with the conductive thread and the velostat. analogRead will take the voltage read at pin 9 (it will be between 0v and Vcc) and map that between 0 and 255.
Does that help?