How do you make a bungee cord server display the combined online player count of all of its servers?

I have recently upgraded my server to two playable servers and a bungee cord server to travel between the servers. My only problem is that the bungee server does not show the combined player count for both the servers in the multiplayers server list. It only shows the player count for the main server connected to it. So my question is. How do I make the bungee cord display the combined amount of online players for both of the server on the multiplayer server list?

Here is the config for the...

How do you make a bungee cord server display the combined online player count of all of its servers?