Can I auto ff my promo games for the class up (ie. silver to gold, gold to plat, plat to dimond)?

5 games is a lot to play, especially if your down 2 already. Can't i just give up and start off like I lost my promos? I don't want to play 2-3 games with the "hope" I can hard carry. The "hope" my teammates won't feed. The "hope" that these other 4 people know what they are doing. Basically I'd rather restart at 0 than try to win the remain 2 or 3. Especially if I'd need to win so many in a row. I'm mostly speaking for wining 3 in a row, possible yes, but likely, not so much. Doesn't mater what ELO your in, unless your on a alt account. 3 Wins is hard in solo queue. So I'd rather start fresh than start in a hole so to speak, and hopefully next time, i won't fall or jump into that hole.