Powershell Json object from object - sql

Question

I have a method that returns a Json object from a query using the FOR JOSN PATH approach.
Example:
SELECT State, COUNT(*) AS Items
FROM dbo.States
WHERE SomeFilterColumn = #FilterParam
GROUP BY State
FOR JSON PATH
This returns
[
{
"State": "Pending",
"Items": 23
},
{
"State": "Finished",
"Items", 7736
}
]
I also have a function in Powershell that returns the result. However I have issues how it is returned.
function Get-Json-From-Query {
param(
[Int32]$filterParam
)
$SqlConnection = New-Object System.Data.SqlClient.SqlConnection
...
$SqlCmd = $SqlConnection.CreateCommand();
$SqlCmd.CommandText = $Query #The query shown above
$SqlCmd.Parameters.Add("#FilterParam", $filterParam);
$SqlCmd.ExecuteScalar()
}
However I do not know how to get the result of my query properly added to a JSON value.
I tried many things like:
#{
States = (Get-Json-From-Query -filterParam 1234)
}
However this gives me also the param information which I do not want:
Expecting
{ "States": [... The Array show above ... ] }
Actual
{
"States": [
{
"CompareInfo": 0,
"XmlSchemaCollectionDatabase": "",
"XmlSchemaCollectionOwningSchema": "",
"XmlSchemaCollectionName": "",
"ForceColumnEncryption": false,
"DbType": 11,
"LocaleId": 0,
"ParameterName": "#FilterParam",
"Precision": 0,
"Scale": 0,
"SqlDbType": 8,
"SqlValue": "1234",
"UdtTypeName": "",
"TypeName": "",
"Value": 1234,
"Direction": 1,
"IsNullable": false,
"Offset": 0,
"Size": 0,
"SourceColumn": "",
"SourceColumnNullMapping": false,
"SourceVersion": 512
},
"[{\"State\":\"Pending\",\"Items\":23},{\"State\":\"Finished\",\"Items\":7763}]"
]
}
How do I get the right data in my Json object?