Adding content after your posts is not that hard as you can always create a plugin to do it or manually add code to your child theme. The Add Widget After Content WordPress Plugin can also help. It is a handy plugin that lets you add a sidebar to your posts and pages to display content after your posts.
This plugin lets you exclude specific pages from showing after content widgets. In fact, you can choose which posts types and formats should be showing the widget. You can treat the After Content sidebar like a regular sidebar for all your favorite widgets.