CC2640R2F: Overriding default scanner packet length

I am writing some custom firmware on a CC2640R2F and want to extend the maximum possible scanner packet length. I appreciate that this is outside of the BLE specification but this is a custom application.

The TRM (CC13x0, CC26x0 SimpleLink™ Wireless MCU Technical Reference Manual) (Literature Number: SWCU117H) for the CMD_BLE_SCANNER command (section 23.6.4.5) states:

"all received packets with a length field less than

or equal to the maximum length of an advertiser packet (37, but can be overridden) are considered valid"

It does not state how to override the value of 37. Can you share how to do this?

Thanks