Lime

When Jinx blows herself up, exactly as the explosion is starting we see this:

see that purple flash in the upper right corner? that's jinx. we know she can move at supernatural speed thanks to shimmer, and when she does we see that effect with that exact color. She got away right before being blown up.

2. Afterwards, we see Cait looking at the map of the hexgate tower. While holding the broken piece of Jinx's toy weapon. She's trying to figure out why they couldnt find Jinx's body, if she could be alive.

We see on the map that there are some kind of passages or ventilation shafts on the bottom of the dome, right where the explosion occurred. She got away through one of those.

3. The last shot of the series is a flying ship (with majestic and hopeful music in the background):

At the beginning of the very first episode of s1, Powder sees an identical ship

and says:

4. Right after the ship, we see "The end" written in Jinx's style, BUT just for a moment, almost as if they wanted to "hide" it (but not really cause it's pretty obvious still) as a not so suble message that Jinx is alive. Like to me this is the show saying, "JUST in case you didn't figure it out, here's a hint":

So she's alive and she left Piltover. And we know why she decided to leave.

1) She thought Vi would never be happy as long as Jinx was there:

2) she felt trapped. While in prison we see this:

she hallucinated Silco saying:

That's foreshadowing if i've ever seen it.

3) also she's a war criminal and she would've definitely gone to prison after the war was over, so smart move

All in all, leaving town is a pretty happy outcome considering she wanted to kill herself not long before.

Conclusion

The coven: "Mrs Hart"

My grief cannot be measured. Yuri on Ice has been part of my life since it aired in 2016 😭

I hope that we can keep the fandom alive.