Wil6210: how to get the RSSI

Hi all, I have a couple of devices Mikrotik wAP 60g (https://mikrotik.com/product/wap_60g ) and I installed OpenWrt following this guide: https://github.com/pjimenezmateo/openwrt .

I'm able to start a Mikrotik device as AP and the second one as STAtion. Running on the STA iwconfig wlan0 I get the "link quality" and the "signal level". Looking at the wil6210 documentation (the driver for the 11ad chip) I read that the "signal level" is computed according to the RSSI. However, the value of "signal level" reported by iwconfig is not in dBm but on a scale of 1 to 100 (e.g., 100/100, 85/100, 20/100).

Does anyone know if there's a way to get the received power in dBm?