WebAPI POST Array dataset?

I have created a WebAPI - Write to Database - POST

When I send an array of data, it only takes the first dataset. How to process all the records in the array?

a!localVariables(
local!value: cast(
'type!{urn:com:appian:types:YM}XX_WebAPI',
a!fromJson(http!request.body)
),
a!writeToDataStoreEntity(
dataStoreEntity: cons!XX_WEBAPI_TC,
valueToStore: local!value,
onSuccess: a!httpResponse(
statusCode: 200,
headers: {
a!httpHeader(name: "Content-Type", value: "application/json")
},
body: a!toJson(
fv!storedValues
)
),
onError: a!httpResponse(
statusCode: 500,
headers: {
a!httpHeader(name: "Content-Type", value: "application/json")
},
body: a!toJson(
{
error: "There was an error writing to the data store"
}
)
)
)
)

Sample Data Set:

[
{ "Column1": "AA",

  "Column2": 1111

},

{

"Column1": "BB",

  "Column2": 2222

},

{

"Column1": "CC",

  "Column2": 3333

}

]

Thanks