Using your Eng2 pic numbers;
1. Power Distribution Centre.
3..... The box sitting on the side of the shocky tower is the glow plug module.
4. TIPM, info under the lid.
The Glove Box manual should explain whats in the fuse boxes ....
Being a 2011 not the same as my 15, 5 speed tranny may have a tube at back of eng bay with a cap on it but no dip stick, need to get a universal one and set it up.
If you dig around on this site
https://jeepspecs.com/grand-cherokee/wk2-generation/ you should find your answers... Original site was brilliant but it was taken over by some other mob who revamped it but didn't know what they were doing and now its difficult.