How to embed a View inside another View
GravityView version 2.19 introduced an easy way to embed Views inside the Single Entry layouts of a View by using a new "GravityView View" field in the View editor:
Once the field is added, you can access its settings to configure the embedded View.
You can even filter this View by using a field value from the current entry, just like if you were using the search_field and search_value parameters of the [gravityview] shortcode: