How to protect FOTA upgrade over BLE using passkey?

Hi everybody.

Recently, I've spent nRF Connect SDK Intermediate online course.
I could add firmware upgrade ability using FOTA and now, I can update the firmware using nRF Device Manager app.
I noticed it doesn't ask me about passkey at connection process. Is it possible to add passkey for this purpose?

Thanks in advance
Mehdi Sadeghian

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