macOS optiom does not show in Clover Bootloader. What I have done: formatted USB drive and partitioned it into two parts; EFI and macOS, installed macOS High Sierra and installed Clover EFI
Dual Boot UEFI Windows 8.1 and Mavericks 10.9.4 Using Clover Bootloader | Techs11
Manually install Clover and configure boot priority with EasyUEFI in Windows - Clover Guides | InsanelyMac