Is there a way to write the bootloader to multiple drives?

[myglc2]

I have a headless GuixSD server w/raided system drive ...

(operating-system
  (host-name "g1")
  (timezone "America/New_York")
  (locale "en_US.utf8")
  ;; RAID1 root using 1 NVMe SSD + 2 HDs
  (bootloader (grub-configuration (device "/dev/nvme0n1")))
  (initrd (lambda (file-systems . rest) (apply base-initrd file-systems
                                               #:extra-modules '("raid1")
                                               rest)))
  (mapped-devices (list (mapped-device
                         (source '("/dev/nvme0n1p1" "/dev/sda1" "/dev/sdb1"))
                         (target "/dev/md3")
                         (type raid-device-mapping))))
  (file-systems (cons (file-system
                        (title 'device)
                        (device "/dev/md3")
                        (mount-point "/")
                        (type "ext4")
                        (dependencies mapped-devices))
                      %base-file-systems))

It works great, but, when the bootloader device is lost, the system
won't boot :-( I looked at the doc and Mathieu Othacehe's current patch
-- (Re: bug#26339: [PATCH] doc: Adapt to multiple bootloader support) --
which doesn't seem to address this question, so I am wondering ...

Is there a way to have 'guix system reconfigure' write the bootloader to
multiple drives?

TIA - George