You cannot run data cable in the same raceway, conduit, gutter etc. as AC mains electrical wires.
The only exception is low-voltage circuits that are entirely contained within AC mains-rated junction boxes and enclosures. That's how it's legal to install things like the Sense home energy monitor; the entire kaboodle sits inside the service panel (which is obviously mains rated), and nothing but a WiFi antenna sticks out.
What you definitely cannot do is have an Ethernet in the pipe with power wires and have it come out to an Ethernet cover plate where you then plug in a cable and plug it into the back of a PC or Roku box. Of course that's what you wanna do, right? :)
That's why there's no such thing as a receptacle with one 120V socket and one Ethernet socket. That would never be allowed. (well I'm sure someone in China makes it and sells it on Amazon, but it's illegal as heck. Amazon is as junked up as eBay these days).
Fiber optic, however, is a different deal. If the fiber-optic cable is entirely non-conductive (you must check), then yes, that can go in and out of AC mains conduit all it wants. So a receptacle with one 120V socket and one fiber socket is legit. Ethernet-fiber converters are cheap these days.