I use the new identity of ASP.NET Core 8:

builder.Services.AddAuthorization();

builder.Services.AddIdentityApiEndpoints<IdentityUser>()
    .AddRoles<IdentityRole>()
    .AddEntityFrameworkStores<DefaultDbContext>();

// ...

var app = builder.Build();

app.MapIdentityApi<IdentityUser>();
app.UseAuthentication();
app.UseAuthorization();
app.MapControllers().RequireAuthorization();

but I don’t find any documentation how to add roles to specific controller or route.