Android TV - Xiaomi

I want to install the Brave on a Xiaomi Android TV, but because is Android TV, not Android mobile, when i go to Play Store dont appear.
Where can i find an apk so i can download it on my PC, copy it to a PEN and then from the TV install it.
Also from 2 smartphone casting themto the TV dont show the subtitles on the TV only on the smartphones is show the subtitles, is anything i must do to solve it?