The only way you can access some sort of stats/data would be through the Twitch API. I might be wrong but I haven’t come across any other way of obtaining any detailed stats/data other than the Twitch API.
Only way I can think of obtaining these detailed stats which are in a Twitch users dashboard would be by obtaining a access token and then using this token to get stats using the Twitch API.
Click here to find out how you obtain a access token for your application.