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Boot into NVMe drives from USB

Hi all, I've installed Debian in 2 (mdadm RAID 1 formtted with Btrfs) NVMe drives installed into 2 PCIe adapters. The motherboard doesn't support booting from those drives, so I've installed Debian into a USB stick (and it works) and I wanted to add into grub the RAID NVMe drives. `os-prober` doesn't see the other Debian installation. `fdisk -l` shows the 2 nvme drives, but it doesn't see md0: ``` Disk /dev/nvme0n1: 238.47 GiB, 256060514304 bytes, 500118192 sectors Disk model: SAMSUNG MZVLQ256HBJD-00BH1 Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 16384 bytes / 131072 bytes Disklabel type: dos Disk identifier: 0xab581c58 Device Boot Start End Sectors Size Id Type /dev/nvme0n1p1 2048 500118191 500116144 238.5G fd Linux raid autodetect Disk /dev/nvme1n1: 238.47 GiB, 256060514304 bytes, 500118192 sectors Disk model: SAMSUNG MZVLQ256HBJD-00BH1 Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 16384 bytes / 131072 bytes Disklabel type: dos Disk identifier: 0x863fc92a Device Boot Start End Sectors Size Id Type /dev/nvme1n1p1 2048 500118191 500116144 238.5G fd Linux raid autodetect Disk /dev/sda: 14.32 GiB, 15376000000 bytes, 30031250 sectors Disk model: Ultra Fit Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x1d46a293 Device Boot Start End Sectors Size Id Type /dev/sda1 * 2048 28028927 28026880 13.4G 83 Linux /dev/sda2 28030974 30029823 1998850 976M 5 Extended /dev/sda5 28030976 30029823 1998848 976M 82 Linux swap / Solaris ``` `mdadm --detail --scan` doesn't output anything. How do I solve this problem?

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