Hello,
There is no exact driver for what you are looking for , you will need to develop you own example using as a base the SPI examples .
You can try checking the K32W for the k32w061dk6_otap_client_att_freertos Bluetooth LE example , which is located in the SDK, there are some drivers in the Framework-> Flash->External folder.That would be the closest MCU that you can use to help you in your own development.
Hope this helps.
Regards,
Estephania