ability to add a 3D Avatar that can be customised on a Flutter app?

Question

I am designing an app where we would like to have a capability for users to edit their avatars style. like hair colour and body colour. The app needs to be built on flutter, I checked out various libraries like Rive (Flare) but they do not seem to be working with 3D assets.

I came across this app called VOS which is doing something similar

Any leads will be much appreciated.

Cheers