Hello I don't know if it is possible to request Spotify to add certain Artist, Albums or Songs but I thought that it is at least worth a try. I'm sure Spotify wants to hear customers feedback and try to keep them from moving to another music service provider like, Apple Music, Groove Music, Music Unlimited and so on. I understand copyrights' and licenses have involvement into what songs they are allowed but in some cases that isn't always the case, so at the least bring music to there attention to possibly add because why not, we pay for their service. So I would like to request an Album of a certain artist
Chance the Rapper - Acid Rap
Chance the Rapper - Coloring Books (which just released so it's possible it will be added)
Will edit this post or add songs in the future when they come to mind. Feel free to comment with your request!