If you want to make changes to the startup script you can use
sudo systemctl edit nodered
which will create an override file that you can use to modify or extend the standard file, without actually editing the original. The advantage of using that technique over editing the service file itself is that re-installing node-red will not destroy your extensions.
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This may be the relevant doc you need - https://www.freedesktop.org/wiki/Software/systemd/NetworkTarget/
PS - We do know Node-RED runs on s390x, but I'm not sure I'd want to try to attach wifi to a mainframe with assembler 
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