Custom board programming using j-link

Hello

We are using nrf5340 in the new project. PCB design was made. We are currently waiting for the typesetting process to be completed. There is no Jlink on the designed hardware. We are considering using segger j-link, which we are currently using, in order to throw code during production. We used nrf5340dk in the development process.

My main question is, how can I send code to (nrf5340dk) and (Custom Board our design) using Jlink in the image?
Which files should I use to code via nrf Connect-Programmer?

In my research, there is custom board programming via nrf5340dk, but this is not what I am looking for.

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_nrf91_dk%2FUG%2Fnrf91_DK%2Fext_programming_support.html   

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