The point being that it’s not as hard to start putting the Young Avengers together in the MCU as one might think, and Ant-Man and the Wasp: Quantumania can take the first legitimate steps to doing so.
It’s a lot to ask for Ant-Man and the Wasp: Quantumania to introduce the Young Avengers outright, but even ignoring Cassie Lang and Kang the Conqueror’s presence in the movie, a lot of groundwork’s been laid elsewhere for other members to come to the forefront.
Both the Kree and Skrulls have been established in the MCU, so that allows Wiccan to be brought in.
Miss America, whose real name is America Chavez, is debuting in Doctor Strange in the Multiverse of Madness, and perhaps the Loki series will feature a Kid Loki.