The thing to remember is that data can *always* be entered manually - either by the GM or by the player who owns the PC.
We've been spoiled by the fairly recent level of drag/drop automation in Fantasy Grounds (especially for the to selling 5E official WotC products). But this shouldn't stop us playing games/settings that don't have that level of automation/integration. Enter the data manually. Sure it take a little while longer, but it lets you play with the system/setting/rules you want!