I found information on
https://docs.platformio.org/en/latest/boards/atmelavr/nanoatmega328.html#board-atmelavr-nanoatmega328
that " Arduino Nano ATmega328 has on-board debug probe and IS READY for debugging. You don’t need to use/buy external debug probe."
but only Compatible Tools is [simavr] that is a simulator, so it can debug but only on simulated env not actual board. How to debug on real board ? it “IS READY for debugging”