Eagle and F360 are slowly becoming integrated, which is great.
However - pad design is done inside of Eagle and it sucks beyond comprehension. I am admittedly spoiled with the past 20+ years using Solidworks for parametric design....but Eagle is particularly bad in this area. F360 is only useful to design the 3D part and associate it with the part in Eagle.
In general - I use Ultra Librarian, SnapEDA for schematic symbols and pads. Sometimes they are passable but almost always provide a better starting point than a blank sheet. Some parts, I just duplicate and modify something similar from my own library to avoid starting from scratch.
For some parts that do not conform to any standard - like connectors, switches, inductors, etc....you need a pen, paper, and a hand calculator. The ultimate fail IMHO to need those to make a simple pad layout.