I wonder why tho. Usually a good orgianization would look like this: somewhere in the future there is a big event that has many or maybe even all champs involvedt to varying degrees. Like Marvel's Secret Wars or DC's Future's End. Then you make it so everything builds up to that. Here you have to be cautionous so nothing starts contradicting itself and often stuff gets stomped.
Then you have the champs open for reworkes that are still in the process of redefning them, so stuff gets stomped here too.
However, there are also TONS of characters that are not directly involved in this or any future event that can have their adventures as they please. Get two authors and two artists and tell them to do another comic about Poppy for example. Or about Fiora. Or about Draven. It doesn't have to be much, it can even be comedic, an episode in their life or just a glimps into their everyday reality.
Or literally everything about secondary characters that are no champs. What's the story of Rafen? Or that Shuriman Trader we met in bloodline who live sin that old icathian house, how's he doing? And maybe he finds some voidrunes in there, who knows? ^^
Sure, champions can and maybe even should have cameos in such stories, but there is no need for them to be central.
Get several small teams and within months you would have enough material, you might as well sell it in a comic store. I'd buy it btw^^
The major problem here is the ABSOLUTE LACK OF CONTENT. And the two cinematics we have are flashy trailers, nothing more. So actually they don't really count as they contribute nothing to the lore.