How can we use claims to hanlde role based authentication in a flutter app

[CE You]

I am developing a flutter app which will be used by three different types of users and want make the app in a way that when ever a user logs in the app should show the relevant UI  based on user type. I explored and got a claim based solution (adding a claim in Firebase authentication token) but that seems not working in flutter app.
Can any body please tell me what is the best way to handle role based user authentication in flutter, if it the custom claims then how can we use custom claims.

[Felix]

Define the roles and show part of the based on those roles. There is vanilla JavaScript tutorials by the netninja on YouTube. Follow that.