RAK10701 Field Tester payload decoder for field number

Good morning,

Base on RAK10701 Field Tester documentation (RAK10701-P Field Tester Pro for LoRaWAN Quick Start Guide | RAKwireless Documentation Center ), Chirpstack has a function to know how many gateways the device has in the coverage zone: “normalizedPayload.gateways”

I found a feature called “Gateway discovery”, but I am not sure that it is the answer.

Could you help me?