I managed to transfer first TR workout to Pioneer headunit with a little bit workout. If I can download files in .fit format then it is so easy to transfer them.
Here is what I did
I chose North Pack as example workout. I created exactly the same workout on TrainingPeaks and export it as fit file. Then I installed Android file transfer to my Mac. Power up the head unit (CA600) and connect it to my MAC - This step is important otherwise MAC does not recognize it as MTP device.
Then I just copied fit file under Training folder, went back to head unit and selected Training->trainingMenu- >LinkedMenu->TP01.fit and thats it. I am going to give it a try now