I think its going to be the same as with linux as the chosen 5v seems to struggle to provide the amperage and what should be a fairly smooth PWM operation is sort of all over the place.
Fan Control Software for ROCK5B | ROCK5B PWM风扇控制软件
I am thinking it maybe hardware than software so irrespective of Android or Linux results might be similar.
shenmuecn did a great fan control app but in use its sort of the same as the fan starts very late and acts almost like linear control and not pwm.