Isn’t it the other way around?
ANT+, which is the way they’re connected to the bike computer, does use l/r with seperate values.
BT on the other hand combines the l/r values and sends them as 1 value from the left pedal.
When doing outside rides with ANT+ connection to Garmin, I’m able to analyse my ride on Garmin Connect and view the l/r balance and values.