Fanout capabilities on connectx-7 nics

I was told that starting with fw 28.41.1000, we are now able to configure a connectx-7 nic with fanout functionality.
ex. a connectx-7 nic with a single 400G port can fanout to 4 x 100G ports using a fanout cable.
We were told that this needs to be configured with NVconfig but not sure how to use it or where to find that tool/command.