Arduino Zero UART ot SWD port

Hello, to all!
In short. I have made custom board with Cortex M0+ and I need some kind of serial communication for debbuging. All my I/O and communication pins are used in my project. My question is, can I use the SWD port like "Serial"(UART etc...) throught JLINK or other method? Didn't find any information on the topic.

SWO pin can be used for Serial data, but it has to be setup in sketch and in debugger. I never tested it. I don't see the SWO pin on pinout of the SWD header of Zero.