How do I return Key Value pair Json from MVC controller

Question

I want to return this type of Json from MVC controller

 

[

{

"key": "iPhone",

"values": [

{

"axis": "Battery Life",

"value": 0.22

},

{

"axis": "Brand",

"value": 0.28

},

{

"axis": "Contract Cost",

"value": 0.29

},

{

"axis": "Design And Quality",

"value": 0.17

},

{

"axis": "Have Internet Connectivity",

"value": 0.22

},

{

"axis": "Large Screen",

"value": 0.02

},

{

"axis": "Price Of Device",

"value": 0.21

},

{

"axis": "To Be A Smartphone",

"value": 0.50

}

]]