@shmok@bsd.cafe This thread is popping up for weeks since I first replied. I can assure you the original links posted by @vermaden@bsd.cafe would work if you understand the basics and then follow them. In my case I tested similar partition layout on my laptop where a single disk in GPT layout was used to install #FreeBSD and #OpenBSD. The two systems share a common #EFI partition. But I didn't use the VM image for installing FreeBSD though, which I would not say is substantially important.
CC: @vermaden@bsd.cafe
CC: @vermaden@bsd.cafe