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The only back EMF reporting that is available is Register 0x19 which reports the back EMF of the resonant frequency at the rated voltage output during auto calibration.
In terms of back EMF over frequencies, that is not available.
The test set up in Figure 11 will show you the voltage across the LRA, but it won't translate well to acceleration. If you want acceleration you'll need an accelerometer. While TI does not provide an accelerometer chip you can get the DRV-ACC16-EVM to measure your acceleration, with a direct correlation between G force and voltage output from the EVM.