Accessing an external hard drive via WebDAV

im new in Linux / Server Administration. I want to access an external hard drive (USB-Stick) through a WebDav client. I'm using a Raspberry Pi in my local network. Is it possible to redirect from [ip]/webdav to that USB stick, that I've mounted already in /media/harddrive?

I'd really appreciate your help. Thank you very much.

~DevOFVictory