There's no such spedific capability in FileMaker, but if you insert even one file from that folder into a container field using the store a reference option, a script or calculation field can extract the path to that folder from the data in the container field. And Insert File is something that does open the Operating system's open file dialog which you can then use to locate the folder in question.
And such a file path can then be stored in a text field if necessary. It may, however, make more sense to insert each of the files into container fields with the store a reference option specified.
See this thread for more on file paths: Exploring the use of a $Path Variable in Scripts
Very good and helpful answer. Thanks!