How do I list wp-content/plugins within a child theme?

Hello,
I am having a bit of an issue working out the correct way to list the wp-content folder UNDER a child theme.(or if that is possible). I want to edit a plugin - (directory plugin actually) but can not work out the path.

I have used child themes before to make changes with in a theme but I am not sure if this editing method can stretch to the plugin folder as well as that usually sits one level up outside of the theme folder.
So what I have now is wp-content/themes/child-theme/wp-content/plugins/directory
But that just looks wrong
what is the right way please, if any, am I barking up the wrong tree!!
I guess I could edit the plugin file directly but that won't withstand updates.
Any ideas please?