blscfg module $early_initrd and $default_kernelopts variables

[Mike Beaton]

I was wondering if anybody could possibly help out and clarify, is there any official documentation around the existence, and correct use, of the blscfg $early_initrd and $default_kernelopts variables?

https://github.com/rhboot/grub2/blob/fedora-35/grub-core/commands/blscfg.c#L764
https://github.com/rhboot/grub2/blob/fedora-35/grub-core/commands/blscfg.c#L788