Right now, via our eQEP block, we are not supporting the monitoring of QEPST.UPEVNT signal in Simulink.
However, as a workaround, the "Memory Copy" block can be used and the reference of this signal be provided to be able to read it's state.
Please refer example model "c28035pmsmfoc_cla" shipped with our support package, on how "Memory Copy" can be used. (c28035pmsmfoc_cla -> Hall Sensor C)
You may then design the model to read "QUPRD" around the QEPST.UPEVNT signal and see if it helps.