question for the electricians

as an electrician of over thirty years that box looks typical of any home owner installation the wires are not supported within 6 inches of the box and they did not use crimps on the grounds. also being an older install you need to check wire size back then there was only white jackets on 12 and 14 wire today they are color coded . so check that you first have 12 wire and then confirm that it is backed by a 20 amp breaker you then can pull your feed from that box to install your plug. I did see a red wire if they ran a three wire up from the panel you can use the red wire as a new feed and share the neutral wire because there are less than three circuits using it.