Is it possible to give your opponent extra time?

I have seen some streamers on chess.com giving extra time to their opponent or removing their own. Is it possible to do so or is it just staff members that can do that?

Sometimes I'm launching a dope ferocious attack but my opponent is running out of time and blunders, but I want him to find the best possible moves instead of flagging them or making an obvious blunder so it'd be cool to play on.

I rather leave  the flagging for drawn or losing positions when it's much more fun to do that 

I know lichess has that option, is it possible to do that on chess.com?

In unrated or if you challenge someone I think

I know when playing friends, you can add time in 15 second increments. I don't think that is an option outside of that, but official streamers may have additional features available.

how do you add 15 sec

Can you add the seconds back I'm cheated out of every single game, every game I don't start on 60 seconds maybe 57 if I'm lucky, most games I'm losing with milliseconds before checkmate, so if those seconds were not cheated off me every single game I start I'd win so much more games.

it is on lichess

Check out:

https://support.chess.com/en/articles/8652402-how-can-i-optimize-my-online-chess-performance

https://support.chess.com/en/articles/8705092-how-do-i-fix-slowness-in-live-chess