League of Legends (LoL) Question: Why are my damage, healing and shielding numbers so low on Milio?

Whether I win or lose my games, I check the stats page and I see that my Milio always has the lowest numbers in the game. My damage never passed 10k damage which is understandable because Milio isn’t meant to do damage. But then I check my healing and shielding numbers and they’re always so low even when I win games, I feel like my shielding and healing is never more than 15k. I just lost a game against a Yuumi who had triple my shields, heals and damage. Even when I win games, if the enemy support is a Nami or Soraka or Sona or Lulu, they have way more heals and shields than me. Am I playing Milio wrong? I have good numbers on all the other enchanter supports. I enjoy playing Milio and I feel like I save my teammates more often with Milio than other enchanter supports but my numbers at the end game page always seem very low for some reason.