[TYPO3-templavoila] Dynamically set options in an FCE using typoscript

[kozy]

Hello,

I will explain what should be the result: I'm making a templavoila FCE,
the user can select which images are shown on the page. The images will be
fetched using stdWrap.filelist. But they can come from different
subdirectories in a specific directory.

So I'd like the flexform to dynamically create the options for the select
based on the subdirectories a directory has.

Is this at all possible?

Thanks a lot  for any thoughts on this.