Zack Snyder planned to introduce a female Robin in the DCEU aka Worlds of DC.
Per Metro, while replying to fans on Vero, Snyder revealed his desire to eventually include Carrie Kelley, who made her debut in Batman: The Dark Knight Returns.
Carrie Kelley is a huge Batman fan who ends up saving the hero and eventually becomes the new Robin. The character, who prefers wearing green goggles as her disguise, was created by Frank Miller, Klaus Janson, and Lynn Varley.
Snyder also revealed the Robin costume which appears in Batman v Superman actually belonged to Dick Grayson and not Jason Todd, hinting Dick Grayson was the one who was killed by the Joker.
Back in 2017, Snyder had to step down from production on Justice League following a personal tragedy, with Joss Whedon taking over as director. Warner Bros. recently revealed it currently has no plans to release Snyder’s cut of Justice League.