I reviewed the schematics, and I think the answer to this is a no, but I would still like some confirmation from someone who is more familiar with the Moto Mods platform. I have an idea for a mod and I know that it's possible to access an external 4G antenna in this application for other cell phones. Even if it's not possible, I still think my Mod idea is valid. Now, to find the time and money to get it started...
Really interesting question. Please post what you learn.