Convert XML to specific JSON structure with powershell

Need a help on converting an xml to a specific json structure. XML would look like this,

<DataGrid> 
<DataRow>
    <RowID>1</RowID>
    <Date>26/10/2014</Date>
    <Owner>ABC Company</Owner>        
    <Make>Mitsubishi</Make>
    <Model_Family>Lancer</Model_Family>
    <Submodel>Lancer 2.0 GSR Hatch CVT</Submodel>
    <Origin/>
    <CC_Rating>1997</CC_Rating>
    <Weight>2000</Weight> 
</DataRow> 
<DataRow>
    <RowID>2</RowID>
    <Date>26/10/2014</Date>
    <Owner>ABC Company</Owner>        
    <Make>Mazda</Make>
    <Model_Family>Axela</Model_Family>
    <Submodel/>
    <Origin>Japan</Origin>
    <CC_Rating>1497</CC_Rating>
    <Weight/> 
</DataRow>
 <DataRow>
    <RowID>3</RowID>
    <Date>26/10/2014</Date>
    <Owner>Test Company</Owner>        
    <Make>Kia</Make>
    <Model_Family>Sorento</Model_Family>
    <Submodel/>
    <Origin>Korea</Origin>
    <CC_Rating>2200</CC_Rating>
    <Weight>2500<Weight> 
</DataRow>
<DataRow>
    <RowID>4</RowID>
    <Date>26/10/2014</Date>
    <Owner>Test Company</Owner>        
    <Make>Nissan</Make>
    <Model_Family>Pathfinder</Model_Family>
    <Submodel>SUV<Submodel>
    <Origin>Japan</Origin>
    <CC_Rating>2000</CC_Rating>
    <Weight>2000<Weight> 
</DataRow>

There can be one or more files in above format, my requirement is to read all those files and group them by Owner and call a REST web service by converting those object to JSON. Required JSON format will be as follows.

{
"batches": [
    {
        "Owner": "ABC Company",
        "Date": "2014-10-26",
        "Vehicles": [
            {                    
                "Make": "Mitsubishi",
                "ModelFamily": "Lancer",
                "SubModel": "Lancer 2.0 GSR Hatch CVT",
                "Origin": null
                "CcRating": "1997",
                "Weight": "2000"                    
            },
            {                   
                "Make": "Mazda",
                "ModelFamily": "Axela",
                "SubModel": null,
                "Origin": "Japan",
                "CcRating": "1497",
                "Weight": null                   
            }
        ]
    },
    {
        "Owner": "Test Company",
        "Date": "2014-10-26",
        "Vehicles": [
            {                   
                "Make": "Kia",
                "ModelFamily": "Sorento",
                "SubModel": null,
                "Origin": "Korea",
                "CcRating": "2200",
                "Weight": "2500"                  
            },
            {                    
                "Make": "Nissan",
                "ModelFamily": "Pathfinder",
                "SubModel": "SUV",
                "Origin": "Japan",
                "CcRating": "2000",
                "Weight": "2000"                   
            }
        ]
    }
]

}

This need to be done using windows powershell, Iam a java guy and have no idea how to do it using powershell except calling remote ftp server and read all xml files. Really appreciate, if someone could help me this.