Switching Existing GRUB EFI to secure boot?

I have an 8.0 (maybe 8.1) install originally installed with secure boot disabled in the BIOS.

I am not running ZFS so i am using a grub UEFI bootloader

I am trying to understand the conversion instructions here Host System Administration (proxmox.com)

It says:

An existing UEFI installation can be switched over to Secure Boot if desired, without having to reinstall Proxmox VE from scratch.


First, ensure all your system is up-to-date. Next, install all the required pre-signed...

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