If there is a quiet moment while your child is watching television, perhaps you could join them for a couple of minutes and chat about what they are watching.
If your child likes watching lots of different programmes you can use a chatting chart alongside any programme. You can make comments, talk about feelings, discuss what to watch, offer to help with the remote control etc.
If your child has a favourite show then you can make a chart that features characters from that programme. Due to copyright issues the Peppa Pig chart (below) doesn’t contain photographs of the actual characters, but if you were making this chart for yourself you could add them in from the Internet.
If you have the correct software (Boardmaker, Communicate in Print or Symbolmate) you can download editable versions of these here.