you can backup your EFI partitions, in case you mess them up. I find it a good idea to back them up in any case, I have had EFI partitions get Filesystem corruption.
also the tool rEFInd can work as an alternative boot menu it has the ability to scan the entire system and show all found Bootable OS at boot time.
So with rEFInd, you install it, set it as the default, and it should show windows automatically.
it looks nicer than systemd-boot and grub as well. And it can even show bootable USB flash drives, and has a few other features.