Crank length settings on a power meter

I have a Garmin Rally power-meter that I use on 3 different bikes, each with a different crank length. I also use 3 devices (Garmin 1030+, TrainerRoad on two different Android phones) to record rides
Question: When I change the crank length using my Garmin, will TrainerRoad use the new crank length?
In other words, does the power-meter itself store the crank length, or does the device or app store the crank length?

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