Please see the RFC for clang, since the proposal works the same for flang and clang, and the implementation would be shared (at least in part):
RFC: Alternative spellings of OpenMP directives - Clang Frontend - LLVM Discussion Forums
Please see the RFC for clang, since the proposal works the same for flang and clang, and the implementation would be shared (at least in part):
RFC: Alternative spellings of OpenMP directives - Clang Frontend - LLVM Discussion Forums