I have Galaxy tab A 10.1(2016) and my tab couldn't play twitch(game streaming) 1080p 60fps. It's played like 30fps.
I wonder can Galaxy tab A 10.1(2019) play twitch(game streaming) 1080p 60fps well like on PC.
I don't see that tablet being able to get what you want. Tablets (and phones) just are not made to get the same kind of speeds (for anything) as a computer is. The following link is to data on that device which will show you what it is capable of.