How to filter out specific asset under certain folder?

Development Character & Animation
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302270-hh.png

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~~