First, one does not need second USB if one has network. The 1000:0058 probably requires kmod-mptsas, so:
inst.dd=https://elrepo.org/linux/dud/el8/x86_64/dd-mptsas-3.04.20-8.el8_7.elrepo.iso
as @toracat did show in RAID Installation Drivers Problem - #7 by toracat
In principle the BIOS should be able to load the bootloader from the drive and the bootloader to load kernel and initramfs, and installer ought to have injected the mptsas.ko into the initramfs so that kernel can mount the filesystems from the drive.
Where that did fail? @toracat might know.