Hi,
A given NVRAM entry points to a particular distro shim+GRUB, and it's
not possible to use either chainloader or configfile to forward to
another distro's GRUB. If GRUB wants to support the multiboot Linux
case, it needs some way of discovering other distro's shim+GRUB comb
in NVRAM and on the
This seems related to thread: "How to boot Windows when Bitlocker enabled
with key sealed in TPM External"
https://lists.gnu.org/archive/html/grub-devel/2022-02/msg00072.html
A given NVRAM entry points to a particular distro shim+GRUB, and it's not
possible to use either chainloader or configfile