To clear that jam, you don't need to worry about the hotend. This jam is solely contained within the rear feeder gear housing. You will need to access both sides of the housing, inlet and outlet, and extract the filament from each end. You've likely already pulled the filament from the inlet side, since it's easy to access with no obstruction. To get access to the outlet side, you'll need to disconnect to PTFE hose coming out of the feeder housing. This is simple. Just apply pressure to the ring of the black connector around where the tube is coming out. It should push in a bit, and then you can pull the hose out at the same time. The same can be done at the other end of the hose where there is another connector going in to the extruder body. Removing this tube from both connectors will allow you to take the tube off from either end. You should then be able to grab the filament and pull it out of the feeder housing while holding the feeder gear tension arm away.
You will then want to perform an "Unload" in order to heat up the hotend a bit so you can extract the short piece of filament that broke off up in the feeder housing. You can pull this filament out by hand once the hotend is heated.
After extracting the filament, give the feeder gear area a good brushing through the access hole you removed to take the picture, just to clean out any bits that might have stuck around.
Replace the PTFE tubing in both connectors by pushing the tube in. They will automatically lock into place when they bottom out in the connector. You should be able to hand feed filament back into the printer at this point. You don't have to perform a "Load" function to do most of this. You can insert filament into the feeder housing's inlet port, and while holding the feeder gear tension arm away, you can push the filament clean through all the way to the extruder body, and even down into the extruder most of the way. Then you can do a short "Load" function to heat up the end and make sure filament extrudes correctly. You can end the "Load" sooner since you did most of the feeding yourself.
Hope that helps to clear the jam!
Now... have you diagnosed the cause of the jam/grinding in the first place? It could just happen again.
I have a likely suspect to check while you're clearing the jam. The connector at the top of the extruder body has another short tube coming out of the bottom of it. Try to look down there and see if that short tube is bent and crimped a bit. Mine had a kink in it, which was causing feeding issues.
