Our bootloader is a sinple chainloading one. This means it can only load the partition boot record and start that. This is not how Linux is usually setup: they have grub as a bootloader, which will then directly load and start the kernel.
So, you would need a bootloader inside your Linux partition (can be grub), and use our menu to chainload that. You may be able to configure grub in that setup so that it's mostly invisible (no menu, no timeout).