koobas.hobune.stream
How do I create a Grid array in the inspector which lets me add data like in this image?
This image shows a grid that shows individual elements in an array. What data type can I use to expose elements like this? 
Best Answer
By default there is no type, that can be serialized by unity in the way you want.
You have to create this yourself by creating a custom editor (PropertyDrawer is most likely what you want).
there are no datatype that aare displayed like that, you will have to create your own inspector editor scripts some examples
https://stackoverflow.com/questions/49353971/how-to-create-multidimensional-array-in-unity-inspector
