Can you create users within a skill to be used later?

Hi all,

I'm creating a skill to track stats of darts games. I'd like to be able to add users to the skill itself by using an utterance like "Alexa, add a new user to the darts tracker skill" and then be able to "log in" to those users later when they want to play more games.

Ideally, I want each user to be able to ask Alexa for their stats and receive back something like "Player A has played 200 games and scores an average of 14 points per dart". "Player B has played 150 games and has won 95 of them". etc.

Is this possible to do this without having each new player use an amazon account? I thought maybe as long as the owner of the echo/smart device was logged into it then the additional users could be allocated to that account within the skill somehow?

I'd like to make the process pretty seamless, and making several people log in would be quite a pain.

Thanks in advance