porting issue addtwoints teensy platformio

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Hi there, I'm following the teensy tutorial for microROS and have successfully made it work in platformio. However I severely lack the understanding of how to make any of the other examples work for my teensy 4.1 under plaformio. I'm on Ubuntu 22.04 with ROS2 Humble

Has anybody a working example for teensy under platformio with microROS? Obviously it needs to be able to communicate via Serial

Another question is, Do I need to do anything in terms of FreeRTOS, when going the approach of using micro-ROS with the teensy under platformio on Ubuntu? Or is this all handled in the background?