I use the form block suite on kirby4, which store the data collected via the form and makes it accessible from the panel in the block corresponding to the form.
I ask you: is there a ‘simple’ way to save the data in a google spreadsheet (or csv file)?
Not sure what you mean, but you should probably better ask the plugin author.
But do you mean export the stored data to another file, or not store the form submissions as pages in the first place, but in a spreadsheet? Storing to spreadsheet instead of pages is not a config option in the plugin.