How to filter out specific asset under certain folder?


I setup a var “BaseAnimation”. But in the pic, when in editor you will find all the AnimSequences will be filter out in the dropdown. What I want is, is it possible that add something in the UPROPERTY that setup a file path “Content/Swimming”.
After that, in editor, only the AnimSequences under the folder “Content/Swimming” will be displayed in the dropdown.

Thank you~~