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I can’t find a question like this, but I might not be using the right terms. I am in the US. I need to add a double outlet to an existing circuit. I have all the wires in place, but I don’t know how to wire it up. Below is my diagram of what I want

The diagram also shows the plugs positions to each other. I can’t run a wire from the new outlet, to the far right one. I have the new wire in the wall, with a new double outlet box in place.

There are two different Romex wire bundles into the first outlet. The outlet has both sides of screws wired.

The grounds are bare copper wires.

How can I wire in the double outlet off the single outlet in the wall?