For the first time i'm trying to connect my Open LRS telemetry module with my CRIUS AIOP V2 in order to read RSSI through EOs GUI and seems that something i'm missing here

What i v done so far is...
1) Made a simple filter using a resistor and a capacitor driven from OLRS RSSI PIN to my CRIUS A3 pin.
2) Changed this in config ..
#define RX_RSSI
#define RX_RSSI_PIN A3
but i'm taking no redings in GUI...
What i'm doing wrong ?