In Ready API, How can pass an array (Key, Value) with in an array?

I am new to SoapUI NG.

I am using a Post http method to create a record using REST API. How do I pass value (key, value) to an array within in an array? Please find below the Request body of one of the property in an API and the parameter description.

features: [

{

name: "string",

functions: [ "string" ]

}

]

features : array array of features to define mapping between features and functions

features.$.name : string name of the feature.

features.$.functions : array array of function names please let me know if you have any questions.