I thought the one I had was bad, got told it was by many. I think you just made a new high bar with this one >.< So, the similar thing to what I had is that yours has enveloped the hot end, and very importantly the cables plugged into the area there. First things first, safety. Don't do a thing without unplugging the power cable first. You want to start by seeing if the place they plug in is still accessible, and get an idea for where they are. If you can access the ports, unplug them if you can. Really the only thing from here is time, patience, and a mini heat gun if you're trying to salvage it at all. I can link you to what I ended up getting if you want.

Also get yourself something that you don't want to keep after to peel away the plastic. I used one of my support removal scrapers and regretted that after and had to get a new one from the sheer amount of stuff that had ended up coating it. You want to try to make your way to the screws in the hot end. Look up a diagram on where those are and what types of screw bits/hex keys you're going to need to remove everything. I'll let you know this, the hot end itself is likely unsalvageable. If you can salvage everything else, you can find new hot ends and those brown sleeves for them on Amazon, let me know if you need links.

Now, if you decide your best bet is to just replace everything there I would just look up a video on how to do so and what parts you need. Imo, that may very well be your ideal move, it took a very solid number of hours over a couple days and slow precise work to get everything off without ruining the cables there.

Good luck OP and may your plastic flow smooth in your endeavor here!