Add back Customs for LTM's

Customs with LTM's were one of the most fun things I ever played in season 6 when we still had the old client, ever since the client was changed, Riot has mentioned finishing this during this season however, we have never received any news about it after that. I want to be able to play ARURF or OFA or even Hide and Seek on a map such as Ascension or Dominion, I just want to be able to play a LTM with my friends in a custom. TY :D