How would I assign player from online source?

At the moment we have a website and working on a game for unreal, (character avatars are rendered on the website, using three.js) currently I have it where I can login and such from the game client, however when I load in, is there a way I can have it download the avatar (have three.js export it as obj) and whenever the player joins the map, the 3rd person thing will use the character obj (which has other issues on how it would be rigged… all the avatars would be using the same body, which is relatively simple, 4 blocks for the limb, 1 block for torso, and one for head)