apple TV sound setting

Hello ladies and gentleman,

Can somebody help me? I bought Apple TV 4th generation and have problem with set up the sound. Basically I have a Monitor without sound connector. I am using sound out of my MacBook Pro (Retina 2015)..... I have connected sound interface Focusrite Scarlett 2i2 (because I am recording at home something, and I thing the sound is little bit better than the sound interface of MacBook itself) and I want to use this sound interface Scarlett as a main sound in home and also for the Apple TV..... and than also if I use my iPhone 6s or iPad as a Airplay I also want to use the sound from MacBook that means from the Scarlett 2i2.....

Sorry for my English it is horrible I know! But I really need some help, because I really love this company!!!

Thank you so much

Marek Urbanek