Offline autoinstall(install.conf)

Hey
I have no prior experience with BSD.
I am planning to perform non interactive installation of OpenBSD with some params(like the default root password, network etc) as host on Fedora(guest) using virt-install any suggestions for that?

I have already gone through the autoinstall man page but I didn't understand how to do that using local(offline without the TFTP server) file(do I need to write rewrite the bsd.rd and include the install.conf file? from https://marc.info/?l=openbsd-misc&m=141552533922277&w=2) Or is there any workaround? or can I use initrd feature of virt-install so that I can pass the install.conf (just like kickstart file for Fedora)?(if it is possible and I am not wrong)?

Thanks in Advance.
Best,
RT