Answer

As of this writing there are no Plugins or scripted solutions available (internally or externally) for direct integration to commonly used audio measurement platforms.  Thus immediate usage of Q-SYS and a selected audio measurement platform would be limited to the audio connectivity available in an implementation (analog, AES3, Dante, AES67, and AVB).

However, Q-SYS does have support for a wide-range of control-related applications.  Therefore, it is definitely possible to leverage the API available in many audio measurement platforms for two-way interaction between the external platform and Q-SYS.  To do so would involve leveraging one of the scripted components within Q-SYS.

It is also important to note that within Q-SYS itself there are already available components that may provide a solution for audio measurements in many cases, therefore not requiring a separate audio measurement platform.

Included Components for audio measurement and analysis:
-Signal source components: Sine, White Noise, Pink Noise
-Frequency Measurement components: RTA, Responsalyzer (the latter being capable of FFT with a Reference Channel)
-Level Measurement components: Level Meter, (Peak and RMS), LKFS Meter, SPL/Leq Meter (Linear/A/C Weighting)