TLDR: Add a game where viewers try to guess which games did Cohh, JP and Zeke select and are rewarded points.
In my home country, we have a new year show, where comedians rank there top 5 things of the year in different categories. Viewers can predict rankings and best predictions win prizes. I believe it could be used as activity for interested viewers, like bingo during e3 conferences.
1 point if your guess is on the list
2 points if you guessed the placement
Person with maximum number of points wins
If there is an interest, there could be twitch extension with the leaderboard.
Have a nice day,
P. S.: For brave of hearth, this can also be played as a drinking game