Looks like there isn't :( :( :(
That Vi/Jhin/Vayne short story was so badass.
I think the reason being is that Riot is kind of bad with feels trip stories. Like outside Confessions of a Broken Blade, they're good at "holy shit that was cool", but not as good with "can I give this character a hug? Or a hundred?".
And in this case, well, let's look at the lineup:
Warwick: obvious antagonistic monster.
Pyke: memory-fried undead/reassembled vigilante. Probably not the guy you want as the POV/central character, because it's kind of hard to elicit sympathy for someone like that.
Jinx: brain-damaged psycho.
Akali: probably can't go into her thoughts because there's some implication she's a double/triple agent from Pyke's special interactions.
That leaves...Irelia. And her bios (PROJECT + Prestige) mean that the story would be solemn and feels heavy rather than the sort of city noir badass kind of shtick that Vi, as a cop, gets, for instance, and I'm not sure that's all that easy for Riot to do.
I'd like to be proven wrong because I was eagerly anticipating another PROJECT story.