Hi,
So, I finally found the ino files. You would need the ibus telemetry library (GitHub - Hrastovc/iBUStelemetry: Arduino - iBUS telemetry support)
The limitation - I was not able to transmit decimals, so I ended up sending the 10*V. Meaning for your 3S LiFePo4 battery, that instead of 9.9V you see 99V in transmitter. Not a problem in general I assume, as you can set your alarm at 96V instead of 9.6 or so..
TelemetryMeasurement.ino (640 Bytes)
TelemetryIBUS.ino (528 Bytes)