How to read BGI's STOmics spatial transcriptomics data?

[timtreis]

From user Jack on Zulip:

Does anyone know how to use spatialdata_io.stereoseq to read BGI's STOmics spatial transcriptomics data? Why is cell.cluster.h5ad required? The count output from SAW doesn't include this file. It seems that this file can only be obtained by continuing to use subsequent steps in SAW. Is it possible to only use the SAW count output? What does the standard input folder structure look like, and which data files should it include?