NVTX / RocTX like functionality?

Is there a way for a use code to add self logging to the one trace output?
For example, I could wrap my MPI calls or certain code sections.

This is really useful in nsight-sys and rocprof to mark up and visualise host code and MPI code as well as GPU,
and I'd like to be able to do this on SYCL.

A further, a small LD_PRELOAD_WRAPPER could be written that brings in MPI logging automatically

MPI logging is supported by nsight-sys.