As it stands, the only three confirmed members of the Young Avengers are Ms. Marvel, Kate Bishop, and Ant-Man's daughter Cassie Lang.

Source: https://screenrant.com/young-avengers-movie-characters-updates/

Iman Vellani discusses the potential of introducing Iron Lad and how it could tie the Young Avengers into the Multiverse Saga.

Source: https://screenrant.com/ms-marvel-iron-lad-young-avengers-iman-vellani-comments/

In the comics, Cassie Lang joins the Young Avengers and is known as Stature/Stinger/Ant-Girl.

Source: https://screenrant.com/ant-man-3-cassie-recast-kathryn-newton-emma-fuhrmann/

Keep going with Shang-Chi, Young Avengers and Blade from there on out.

Source: https://comicbookmovie.com/captain-marvel/the-marvels/the-marvels-star-iman-vellani-reveals-another-alternate-ending-addresses-box-office-struggles-and-toxic-fans-a207902

The newest installment also introduces Kathryn Newton's teenage Cassie Lang, a member of the Young Avengers in Marvel Comics.

Source: https://www.cbr.com/ant-man-3-box-office-drop-worry-analysts/