Changing the field names when using multi-value variables?

Hello,
I have a question regarding the field names in a panel. When I select several sensors and several fields for each sensor I get a field display name as → MeasuermentEx.fAverage{sUnitId: Sensor_1} and so on. I would like it to be something like Sensor_1.fAverage instead.
I guess it has something to do with either Field options or Overrides but i can´t get it to work.
How can i accomplice this?

Best regards

Joachim