Task for the [Proteomics Hackathon (Berlin, Mar 2026)](https://github.com/scverse/202603_hackathon_proteomics). Relevant issues: - https://github.com/scverse/spatialdata/issues/225 - https://github.com/scverse/spatialdata/issues/724 - https://github.com/scverse/spatialdata/issues/742 - https://github.com/scverse/spatialdata/issues/233 - https://github.com/scverse/spatialdata/issues/893 CC @MeyerBender