The MotionFX library provide me quaternion and rotation angles (roll pitch and yaw). It is possible to obtain the accuracy for these data from the Library?

[VNava.1]

Hi, I'm using a board which embeds two ST MEMS: ism330dhcx and lis3mdl. I'm exploiting the MotionFX Library to obtain quaternion and rotation. Which is the way to obtain accuracy regarding roll pitch and yaw. I want to understand how close is the value obtained by the merging algorithm respect to the real rotation value