I don't know. There may be other posts on the specific nature of the signal. There have been threads on Bafang/CA3 connections, but I can't remember that particular detail. If it's a torque-proportional voltage somewhere in the 0-5V range, then it's usable by the CA3.
In a research vein, check the excursion with a meter or scope and if it's in range, hook it up to the CA TRQ input and examine the voltage and torque displays on the Console Setup preview screen as you exercise the crank. A harmless bench test that will tell you PDQ.