Clash Player Substitution Feature?

I thought they had this feature when they released Clash the first time around but it’s no longer available? On Sunday I wasn’t able to play all 3 Clash games, it’s difficult for some people to dedicate 3-4 hours straight of LoL. Especially right through dinner. So because of that the team I was on had to forfeit the last game. I wish there was a way they could have found a replacement for me, maybe a system where they can sub me out, as long as the new player has the same or lower rank as the player being replaced?