Unet NetworkLobbyManager - Intercept scene loading to do fading/scene transition

I'm using the NetworkLobbyManager class to load my multiplayer game when all players are ready. Now I would like to add a screen transition/fade before the actual scene change. (I know how to do the fade in offline games.)

Where is a good place to put this when using the NetworkLobbyManager? I will be using a Coroutine to fade in a black image and once it is done, I would like to load the online scene. Do I just disable scene loading in the LobbyManager and do it by myself? Do I need to register something at the manager manually, then? Or are there callbacks from the manager, which I can intercept to be notified, when a scene is about to load and then delay the base call or something similar?

Thank you! :)