Need configuration strings for Rocky 9 VM on Bhyve

I am attempting to install Rocky Linux 9 (RL) as a Bhyve VM on FreeBSD. What I am trying to discover is what grub commands are required to get this to work. I had previously successfully installed CentOS6 and 7 as Bhyve VMs but I had the grub info provided from various sources.

The data I have for CentOS-7 are:

grub_install0="linux /isolinux/vmlinuz"
grub_install1="initrd /isolinux/initrd.img"
grub_run0="linux /vmlinuz-2.6.32-573.el6.x86_64 root=/dev/mapper/VolGroup-lv_root"
grub_run1="initrd /initramfs-2.6.32-573.el6.x86_64.img"

How do I discover what is required for RL?