Standard disclaimer
Do your homework and make sure you understand what's getting connected to what in your rig. It's not in front of me so I can't see all the details. Personally, I'm 100% OK with making a harness or wiring something if needed, but not everyone is. If you're not comfortable with it, lets find a different solution.
Also I don't have lights on any of my vehicles and there may be a "canned" solution. But since I don't know about that I'm going to assume it doesn't exist and you will need to make your own. Which is not that difficult.
Summary
You can probably find an adapter cable (JR to JST) or swap the red connector for a black one. I "think", from looking at your picture, you need the top one, JST Male to JR Female. Again verify it yourself.
Details
First, I would verify the voltage of the red (JST) connector fom the ESC, to verify it's 6V and
make sure you understand the polarity. Then get a adapter cable (JR to JST) to match or swap the lighting connector to JR female. You will need to verify the gender of the JST connector, probably male, if you go with an adapter. I say male, because the female side usually gives power to the male side. So the female side would be on the ESC and the male side would be the lighting controller wires.
Then the new black connector will go to any open channel on the receiver. The power/ground pins on the receiver are bused together, meaning that all the +/- pins are connected appropriately.
One more thing to look for. There are
two different types of JR connectors, see below. The "Futaba" (Left) style connector has the key on the signal side. The standard JR (Right) does not have the key.
You can use a standard JR in Futaba socket but you
cannot use a Futaba in a standard socket with out trimming they key off.
I believe Traxxas uses Futaba style connectors. If so, you can use either one.
If I did this right, your wiring should look something like this. With a male JST and female JR connector.