Xp towards summoner levels

I always wondered why there is no xp earned towards your summoner levels from TFT like there is playing summoners rift, aram or twisted tree line? Aram games are sometimes shorter than TFT games. Some of these games I’m playing in TFT are lasting 30-45 minutes. I really love playing TFT but I don’t like that I’m not getting xp from playing and I love seeing what borders I can get when I hit the next milestone in leveling up. In a way it’s sort of unfair to not be able to earn xp towards leveling up from playing. Sometimes I play for hours and get nothing. Yes of course I’m having fun but I also would like to see that me playing is counting towards my levels. Opinions?