Convert to XLSX Web Operation

In my VS Saas Workflow, I am using the Web "results.convert-to-xlsx" operation to convert a set of feature sets to, ideally a single spreadsheet with the feature sets added as separate Sheets within the spreadsheet, but, at the moment can only convert to an  individual spreadsheet for each featureset (so end up with hundreds of spreadsheets).

Has anyone managed to use this functionality to create a zip file of the spreadsheets? If so, can you please provide an example of how you did this?

Thanks.

Kind regards, Gael