Hello USER,
The SDK(2.16.1) offers an example code where is implemented the FatFs using a sdcard:

Where you can download this example through SDK builder selecting the next option before build the SDK:

At the same time, you can download the SDK inside MCUxpresso IDE clicking the next button:

Inside to the window called "Download and install SDK" you can search the FRDM- MCXN947 in the filter, where it will be showing the available SDK, as shows in the next image:

Also, if you experience any issue, do not hesitate to let me know.
BR
Habib