Query user by their alias

[sbsghaier-bkom]

Hi
I'm trying to implement a way to Query a user profile by their Alias, I have set Pathauto for users profile /team/, and I want to be able to do :
{ user(path: "/team/<a-user-name>"){ id displayName mail } }
I didn't find useful documentation or tutorial on the web, and the official documentation wasn't helpful.
Not even sure if this is achievable, as module 8.x-4.x is in its early dev, but I hope someone could help me to achieve this.