This is what I got from Jeep when I asked about the system in my 2020 model. Assume it's the same in the 2021.
Speaker sizes and power handling capacity
IP contains two 3.5" on top, two 4.5" within enclosures (lower part of dash).
Overhead sound bar contains the same set of these 4 speakers.
all speakers are driven by 46W chip from the amplifier, but rated at 50W (max).
Subwoofer size and power handling capacity
10", 50W per coil. Four coils, so rated 200W total
Subwoofer enclosure volume
Amplifier power output in WRMS
12channels, 46W each = 552W
I've had the sub out and tested it and each voice coil is 2 ohm. I believe all of the other speakers are also 2 ohm.
If you want a cheap small upgrade I added polyfill to the sub enclosure and noticed a differnce (not huge but it is noticable) and I've seen comments from others about adding it to the soundbar and dash enclosures as well.
If you want a decent improvement you're going to have to replace speakers and add an amp as the factory amp isn't powerful enough to drive a 4 ohm speaker well enough.
If you want to fit a different sub into the factory enclosure the JL Audio 10TW3 is basically the perfect depth. I'm going to be fitting a DD SL710 to mine but going to have to make a custom mount for it as it's slightly too deep..
So I'm going to break down those numbers into real world figures, thank you for posting that because I was also curious.
Speakers are 2 ohm 50 watt, driven by 46 watts. So, that means 25 watt RMS speakers driven by 23 watts RMS. This would be the equivalent of 11.5 watts rms per channel for aftermarket 4 ohm speakers. That is less watts than an aftermarket head unit with no amp (usually 14 watts rms per channel output at 4 ohms).
Subwoofer enclosure is .5 cubic ft. Roughly the minimum size for most 8" subwoofers on a sealed enclosure. For porting that volume you can't go bigger than a 6.5 inch.
Subwoofer is 200 watts, so 100 watt RMS @ 2 ohm. It is being driven by 184 watts, so 92 watts RMS.
Amp total output 552 watts, so 276 watts RMS total on 2 ohm, or 138 watts total system power at 4 ohms.
This is much lower power than I thought the system had. I'm going to assume the sensitivity on the factory speakers is pretty high to get the volume they produce.