Add variables into VRM Monitoring

Hello.
I have small question . I am running MPII with Can BMS which is not supplying value of Cell imbalance. I have info about Lowest and Highest cell and its location in the pack. I was able to write small calculator in NodeRed to calculate difference between Highest/lowest cell but i cannot find a way to send and display it into a VRM. Is there any possibility? Maybe to hijack some variable which is not used by my BMS like Starter battery voltage or midpoint voltage.

Maybe it will help someone : I have solved this by creating virtual temperature sensor. Then i have assigned temperature value as my cell imbalance. So it is showing up in VRM as temperature in degrees of celsius. But it is good enough . I have calculated it as 1mV => 1 C . Overwriting values in active devices does not work as they are (probably) overwritten periodically by the driver.

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