Excel to JSON

It would be great if you can add an Excel to JSON activity to Workflow 5 that runs client side. The following library seems to do this job quite well (https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.15.3/xlsx.full.min.js)

Having to use a server side workflow for this is quite painful and also a limitation when using SaaS only software. A client side activity would be much more helpful.