If you already have the .apk, you don't need android studio. That's why I'm confused, but let's go by part.
It's one thing to create the .apk using rpg maker, it's best to consult directly on the official rpg maker forum or if you consult here, you must be clear. Your problem is how export a rpg maker MV game to Android.
I'm not saying this to annoy you, if not, because by asking clearly what you need, it's easier for people to answer you.
To create the .apk you need the android SDKs, which you can download using android studio (That's why I think your problem is creating the .apk).
In google I found the following information:
https://www.wikihow.com/Deploy-an-RPG-Maker-MV-Game-to-Android-with-Android-Stud...
When you have a working .apk, then you upload it to itch like any other game. But uploading the game to itch has nothing to do with creating the .apk