Exporting data using the Folder List action step

I would like to export the list of filenames from a folder. I can create an action with Folder List, followed by Export CSV file - and can create an export file with 11 columns: filename, size, path etc… Is it possible to select which data is exported (in this case, just to export the filenames)?

If I select Folder list, there are no additional options to choose from:

Can I modify the expression to select specific data? (I’ve tried, without success.)

I can achieve what I want by inserting the folder list data into a database, but it seems a slightly convoluted approach, and also probably rather slower (there may be 10,000 files):

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