v0.5.0 of jupyterlab-hdf5 has now been released. This version adds support for datasets of any dimension (from 0 to 32), and includes a new and improved API for lazily fetching hdf5 data and metadata.
There’s already one outside group that’s using the jupyterlab-hdf5 backend to power their own (non-jupyter) frontend project, which is neat: https://github.com/silx-kit/h5web