At this current date 10/08/2020 from what I see nobody is able to block youtube ads on a smart tv or through the youtube app on a non-rooted phone. You can set up a pihole or dns ad blocker but this will not block any of the ads due to sneaky use of dynamic video ID to serve ads.

More information here: https://discourse.pi-hole.net/t/how-do-i-block-ads-on-youtub...