Yes, Vivo Y95 does have the GPS support.
Yes, Vivo Y95 does have the gyro sensor.
Vivo Y95 has an aperture ratio of f/2.0 for its 20MP front camera. While the rear camera has f/2.2 & f/2.4 aperture for the 13MP & 2MP cameras respectively.
No. Vivo Y95 does not have the front camera flash but it does have the display screen flash.