There could be fan entries on the shows. I have 4 entries on the show to follow it. The first is taking place half a decade after Clark Kent became Superman. Those entries of mine are ideas for television movies.
Legion of Doom
Ultimate Villain Showdown
I have ideas for pre leigion of doom. Maybe following the ending of the episode Finale Superman with Batman and Tim Drake known as Robin and Stephanie Brown known as Bat Girl take on the Joker, The Royal Flush Gang and Harley Quinn. They defeat those villains just as the Joker is behind putting the bomb in the elevator.
In the close up as of why Lex Luthor is impeached as president of the United States (he ran in 2016) he had in league with him the Penguin, The Riddler, The Scarecrow, Killer Croc, Giganta, Cheetah, Sinestro, Gorilla Grodd, other aliens as earlier Yellow Lanterns and Mirror Master. Superman defeated Mirror Master. Batman defeated the Riddler and the Scarecrow. Robin defeated the Penguin. John Stewart as the veteran Green Lantern defeated Sinestro as he's the founder of the yellow lanterns. Wonder Woman defeated Cheetah. Tess Mercer as Red Tornado defeated Giganta. The Flash defeated Gorilla Grodd. The Green Lantern won the war against the Yellow Lantern. Batman defeated Killer Croc just as Gotham cops arrested the Riddler and the Scarecrow. Bat girl facing the League of Assassins defeated Talia Al Guhl just as years ago Batman when he started out defeated Ra's Al Guhl. Others in the Justice League defeated the League of Shadows. Ra's Al Guhl somehow died of the Manhunters killing him long ago before Superman became a Green Lantern. Star Fire and Beast Boy have been trained as Teen Titans along with Robin Tim Drake by Super Boy and other original members of the Titans team. They learn Lex Luthor assembled those super villains. Maybe other women in the Justice League defeated the not named members of the Female Furies from Season 10.
You fans could write in ideas for comic book side stories on the television reunion movie ideas.
Maybe there could be a Legion of Super Heroes entries to follow the reunions with Superman when they faced the Fatal Five just as black kryptonite was effective on Brainiac 5 and he has the Fatal 5 working for him just as Superman older takes on Brainiac in the time traveling crisis.