Static ip address in Home Assistant (without USB stick)

Hi.

I have hassio run on my raspberry pi 4 and it should have static ip address. I made it as the manual said with USB stick with name CONFIG and it works fine, but i dont want use that stick like that forever and I found a solution on this forum when you should import settings from the USB

and it works fine after a reboot. The question is where those static ip settings saved? Some config files in hassio files system?