Haven't really dove into addon creation yet, but I'm just wondering if you can make HTTP requests within addons? Or if you can use other Lua libraries? From what I read on the wiki, it seems like Lua for ESO addons is limited?
Not directly from the ESO context. All you can do is write yourself a script or small program to read out settings files from SavedVariables folder. Like eso-database do it. There you need a small client which upload the data for u.