Is there a grub-cfg-mode available for editing the grub.cfg or some mode that can help collapse the menuentry sections?

I'm perusing some `grub.cfg` files which have accumulated too many entries and a mode with an outline mode that narrow to the `menuentry` and the `submenu`s would be nice. Anything like that?

The "grub.cfg" by default opens in `conf-space-mode`. The `imenu` outline and `hs-minor-mode` folds work fine.