how can I use gpiozero robot library to change speeds of motors via L298N

In my raspberry pi, i need to run two motors with a L298N. I can pwm on enable pins to change speeds. But i saw that gpiozero robot library can make things a lot easier. But When using gpiozero robot library, how can i alter speeds of those motors by giving signel to the enable pins.

To alter the speeds you need a PWM signal which can be done without using any library.

To create a PWM instance:

p = GPIO.PWM(channel, frequency)
To start PWM:

p.start(dc)   # where dc is the duty cycle (0.0 <= dc <= 100.0)
To change the frequency:

p.ChangeFrequency(freq)   # where freq is the new frequency in Hz
To change the duty cycle:

p.ChangeDutyCycle(dc)  # where 0.0 <= dc <= 100.0
To stop PWM:

p.stop()