You have downloaded and unzipped a recovery ROM and you want to re-structure it yourself that you could flash through Fastboot?Even if I take img from the firmware-update directory (from the recovery firmware) and correct the checksums in windows_fastboot_update_rom.bat (if there is a check)?
There are no (official) instructions for and I doubt you will get some
You can try yourself, compare an older or so fastboot ROM structure and create/adapt but be aware you may risk the brick.
Also, if you would have any problem, you could not ask here for help
IMO, it's much easier to learn one-time how to install TWRP.
After that, everything is as easy as booting to TWRP, selecting recovery zip, taking Install and rebooting (if instructions would not additionally require to format Data)
And only that second part will apply for all your future Xiaomi.eu updates - you shall no more need to (re)install TWRP yourself
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