I have been looking for this also. I have searched and searched and can't find it anywhere. I don't think it exists, hopefully I am wrong. My 2013 Dodge Durango had this and was able to store 50 songs and 50 artists. I started adding songs and artists on the new L, I got a message that I was at max. I don't think I had more than 25 total. Nothing like going backwards in technology.
There is a screen that shows your favorite stations and the song that is currently playing on it. You access it by selecting the bell icon at the top right, then selecting favorites. I liked the older Uconnect that had a screen that showed what station your favorite song or artist is playing on if you missed the pop up.