How to use LLVM to compile to other platforms?

[xuxiaocheng0201]

According to another discussion, I use graalvm 23.0.1, which is the last version that can use LLVM without building from source code.

openjdk version "17.0.8" 2023-07-18
OpenJDK Runtime Environment GraalVM CE 17.0.8+7.1 (build 17.0.8+7-jvmci-23.0-b15)
OpenJDK 64-Bit Server VM GraalVM CE 17.0.8+7.1 (build 17.0.8+7-jvmci-23.0-b15, mixed mode, sharing)

I added -H:CompilerBackend=llvm option, and successfully built the artifacts. But these still worked on the host platform.
I tried to add --target android-aarch64, but it printed Error: Unrecognized option: --target.

So what should I do to complie to other platforms?