Afk/disconnect in ranked games

i have an idea/request. what if you implemented a system where if someone disconnects/afks/never connects before a certain point in the game that team would lose less LP if they were to lose the match? I dont have many issues with the ranked system but im sure everyone can agree its really annoying when you go in to a game and someone leaves or never shows and its a 4v5 just to lose the LP you worked to get in the previous games.