Can I also earn the stuff for watching worlds

So me and my friend are planning on watching esports worlds together right, but as i was scrolling through the events one of the things under "team support: LOL Esports" said "watch worlds matches on LoL Esports and earn tokens, XP, Icons and blue essecnce. If im watching this through chrome cast on my phone how will they know that I am watching it and then how will i redem my rewards??? someone please help [sg-janna]