Accelerometers are capable of measuring the acceleration they experience relative to free-fall. Accelerometers are used to measure the upwards acceleration that counters gravity when at rest, its a hoax that it measures the acceleration due to gravity. This acceleration is measured as 1 g (g = 9.8 m/s2) on the z-axis, when both pitch and roll angles are zero, but when the sensor is tilted either the x-axis or the y-axis experiences a component of the upward acceleration, whose magnitude depends on the tilt angle. Now, moving to gyroscope, analysing the gyroscope reading means to determine the roll, pitch and yaw axis of a device with respect to its initial position. Now, coming to your question, in your case as we have obtained the acceleration readings from the accelerometer, we can apply the below mentioned formula to obtain gyroscope readings from accelerometer readings.
(Here, $\phi$ = roll and $\theta$ = pitch)
$$\tan \phi_{xyz} = \left(\frac{G_{py}}{G_{pz}}\right)$$
$$\tan \phi_{xyz} = \left(\frac{-G_{px}}{G_{py}\sin \phi + G_{pz} \cos \phi}\right) = \frac{-G_{px}}{\sqrt{G^2_{py}+G^2_{px}}}$$
If you are curious enough to know more about these formulas and the source from which I obtained these formulas you can open the link below and have a look at the document.
Tilt Sensing Using a Three-Axis Accelerometer
Here, Pitch equation is defined always to be positive, so the range of the equation is [-90, 90] and roll equation provides [-180, 180] range. When the pitch angle is 90º, the roll axis is directly aligned with the axis of gravity, thus we cannot measure the roll angle in this case. Also, the roll equation is undefined when both Gx and Gz are equal to zero.
Hope this cleared your doubt. If any further doubts persists, feel free to write.
