Tell the NetworkManager to spawn individual playerPrefab from Client

Hello,

i am trying to set the playerPrefab from a client before the NetworkManager is spawning it. In this way the client has the possibility to change the playerPrefab before he is joining the game. But i cannot find a way to tell the server which prefab should be used.

I've tried to do a RPC request before OnServerAddPlayer(...) spawnes the prefab but the RpcRequestPrefab() function only runs on server side.

 public override void OnServerAddPlayer(NetworkConnection conn, short playerControllerId)
 {
     playerPrefab = RpcRequestPrefab();    
     base.OnServerAddPlayer (conn, playerControllerId);
 }
 
 [ClientRpc]
 public GameObject RpcRequestPrefab()
 {
     return character;
 }

What is the right way to get the playerPrefab from client so that the server is able to spawn it?

Thanks a lot!