Getting all 4 drives to register on one grub bootloader

I have have 4 hard drives on my desktop and all of them are bootable drives. Three of them boot to Debian 10 and the 4th boots to Kali Linux. The drive my desktop boots to by default allows me to boot to one other of the drives in the grub menu, but to boot to any of the other drives I have to go into the BIOS and manually override and boot to that drive by requesting it.

My question is this:

Is there a way that I could add those drives as available bootable drive-options on my first drive's grub screen?

Thanks in advance.