Hello, actually, the 1PJ module is no longer supported. So it would be better if you use one of the newer modules with better support. For example, the Murata Type 1MW (https://wireless.murata.com/type-1mw.html ) would be a great option for you. 1MW also has SDIO based interface and provide 802.11ac+BT 5.0, just like 1PJ, so it will work with i.MX 8M Mini very well. Refer to the Murata Quick Start guide on details of how to bring it up:https://wireless.murata.com/datasheet?/RFM/data/murata_quick_start_guide_linux.pdf .
Murata 1PJ module resources (datasheet, purchase information) are available at: https://wireless.murata.com/type-1pj.html . Although the order number is different from what you mention, it does use the QCA9377 module.
This module is manufactured and supported by Murata, so I would recommend contacting them directly asking for the technical information available and purchase information.
