Implementing a 1st-person "Grid" battle system

Hey everyone!
So I'm trying to work out a battle system that would ultimately look a little something like this.

Different attacks/skills will affect different sections of the "grid." Allies would be on a 3x3 grid, same as enemies, and some skills might impact both sides (essentially making this a 3x6 grid, but enemies can't cross into to the bottom 3 rows and vice versa).
Does anyone have any suggestions where and how I might begin implementing this system? The YEP Battle Engine Core doesn't seem to work so well with first-person battles. I've written out some of the pseudocode for all of this but I don't know the first thing about JS.

I'm making a ARPG game right now (like Zelda) but if I ever developed a classic RPG Game, I can see myself using a switch that would turn on the event "Start Battle" or something, then put all those pictures and even more variables for each enemy, HP, and switches for enemies, HP that I would turn off after the variable is over, that's how I would do it.

A battle engine must be the easier solution but you can't customize that much.

Never underestimate the power of Eventing. Yes, it would be a daunting task to event a battle system such as this one, but it's not impossible.
If you put your mind to it, I'm sure you'll be able to find a way to do it. On the other hand, if you have a lot of money, you should certainly be able to find somebody to code something like this for you.

Doing a highly unique battle system like this will most likely require a plugin for optimal performance and better complexity. It is possible, but I haven't seen many "semi-tactical" battle system like I call them. I made one for my game (not for public usage, sorry) in the traditional third person view, but it proves that semi-tactical battle system are a thing.

You might be able to use Yanfly's Area of Effect and/or Row Formation plugin to create a system like this. (I haven't used either of them myself, just going from their descriptions.)

Any suggestions on where to best learn the necessary Javascript? Moving the cursor around should be easy enough, it's putting Monsters/Troops into the new system that I'd be most unfamiliar with. Probably the default help file has some necessary stuff so I'll look there next.

@atma505 If you already know javascript, just mess around with the default files, look at the help file (although that didn't help me much). Creating a battle system just takes time and patience.

If you don't know javascript, or aren't sure about your skills about coding such a thing, you could practice by trying to code something simpler (like a menu) and slowly raising the bar until you're comfortable enough to code your battle system.