Inky - Adding interjections from another NPC

I would like to create an inky script for a conversationalist with text that makes it looks like another conversationalist is injecting a comment. Allow me to explain by example...

Let's say I have a conversationalist named Bob. There is another conversationalist named Jim nearby. I would like to have a conversation that looks like this:
Bob: I really like this fall weather...
Jim: It's too cold for my tastes...
Bob: You are always cold!

I can try to write it like this:
==INTERJECTION
I really like this fall weather...
Jim: It's too cold for my tastes...
You are always cold.
->MOVEON

But it comes out looking like this, with each line starting with "Bob:"
Bob: I really like this fall weather...
Bob: Jim: It's too cold for my tastes...
Bob: You are always cold.

Is it possible to make it look like the other NPC is talking? Or suppress the part that says that Bob is talking? I have not found anything in the forums.

Thanks!
-Smeg