UMA 2 & Photon Fusion Avatar Sync

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Hi, I'm using Unity & Fusion for a personal project. The project premise involves players being able to customize their avatars (made with UMA and only customizable in the main menu not while ingame (game scene)), join a session with other players where everyone will be able to see each others Avatars. UMA uses a very long string / JSON to save / load their avatars. The Avatar strings can be saved locally or through any other services or custom backend.

What I'm struggling to figure out right now is, what would be the best way to get the avatar recipes for each player in a session & load their respective avatars which is to synced over network for other players.