Build custom bootx64.efi compatible with Tumbleweed

Hello all!
I try to reduce an EFI partition size of the standard Tumbleweed minimal cloud image and for educational purposes would like to build the “bootx64.efi” from scratch.
Is there any information on how the standalone set of files bootx64.efi, grub.cfg and grub.efi was made for the original Tumbleweed image? It should be definitely related to the “grub2-mkstandalone” command, but any helpful details would be appreciated.

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