Hello chumir. I have just looked on my Chromecast. I could install the Yallo TV app on the Chromecast. It is displayed in the Play Store on the Chromecast.

I'm similar to "Anonymous" - I rarely use Chromecast - but I've never noticed Yallo (I'd be surprised if it were available)

I don't know, I haven't used it for a long time and only bought it to try it out.