Calibre with WebDAV mount

Dear Community,
I’ve already been two full days reinstalling everything and I was not still able to mount on calibre a WebDAV folder.
My purpose is to mount through WebDAV on my host a folder from with my ebook library from Nextcloud, and pass it to Calibre. I was able to get the mount in the host using rclone, but the Calibre server container is not being able to get this data.
Could you please help me about which steps I may be missing?

I highly appreciate your help.