According to the documentation there is no url type. These are the data types
https://www.wix.com/velo/reference/$w/table
The type of data in this column: “number”, “string”, “date”, “image”, “bool”, or “richText”.
There is a filed in the data fetcher called linkpath. I have not used it, but I would read through in the docs and see if that will work for your scenario