How to get/build libomptarget-nvptx-sm_XY.bc for Windows?

LLVM-project can build the bitcode library on/for Linux, but not on/for Windows (I used MS Visual Studio 2019, LLVM 15.0.0, and CUDA v11.5).
What is the way to get such a library for Windows?
I’m interrested in libomptarget-nvptx-sm_52.bc to use it by clang++.
(It would be great if it could be used with both Clang/C++ and Flang/Fortran.)