how nrf52820 config pin to output log

Dear nordic:

  There is a problem while debugging the nrf52820 based on ncs v2.6.0

  I wanna see the log via debug but failed, the circuitry is as the pic.How I can config the pin and prj.conf file to enable debug to output my log via "printf()" or "LOG_INF()"?
  
  Best wish.

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