Retrieving I/Q RX Samples - NB-IoT Cellular Modem

Hi, 

I previously saw in open threads that it was possible to retrieve I/Q samples from the BLE chip inside nrf9151 DK in order to save them. 
I would like to reproduce this process, retrieving the I/Q samples received by the cellular modem for external post-processing. 

Is it possible, and if it is what documentation should I use ? 

Sincerely. 

Miguel

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