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A few people have made some progress into working with UEFI in Rust, and the results are here: https://github.com/rust-osdev/uefi-rs
Long story short, it appears there is no way to get started with UEFI (cue more downvotes). I've even spent a week carefully copying code beginning here: https://github.com/rust-osdev/bootloader/blob/main/src/bin/uefi.rs only to discover that nothing displays to the screen. There is an error somewhere in the 500 lines required to print a character to the screen, and it's impossible to tell where it is.
I suggest looking at the 3rd edition of Philipp Oppermann's blog OS that I mentioned. It's still very much a work-in-progress, but the section on UEFI booting is pretty much done. It's not hosted anywhere yet, so you'll have to clone the repo and switch to the edition-3 branch, then install Zola 0.13 (cargo install zola --git https://github.com/getzola/zola.git --tag v0.13.0) and run zola serve in the blog directory.