There doesn't seem to be a lot of information on the QCA6390/QCA6391 for Windows OS other than the Qualcomm 220.127.116.119 driver package below from the Microsoft catalogue which means the driver is included in Windows after updates, which would be the best thing to do before experimenting. There is some Qualcomm QCA6391 M.2 cards sold on Alibaba, but that is about it.
- Qualcomm-Atheros QCA6391
- 2x2 MU-MIMO and Bluetooth Combination Solution
- Supports IEEE802.11a/g/n/ac/ax
- Supports Bluetooth 5.1, ANT, IC and Bluetooth Milan Ready
- M.2 2230 "E Key" Form Factor