Key Value Pairs Conversion has me scratching my head

Key Value Pairs Conversion has me scratching my head

I have an object that looks like this:

{
    "KeyValueOfstringstring": [
        {
            "Key": "FET",
            "Value": ""
        },
        {
            "Key": "FFS2",
            "Value": "Z"
        },
        {
            "Key": "LoadIndex",
            "Value": "91"
        },
        {
            "Key": "Ply",
            "Value": ""
        }
    ]
}

And would like to transform it to look like this:

{
    "KeyValueOfstringstring": [
        {
            "FET": 123
        },
        {
            "FFS2": "Z"
        },
        {
            "LoadIndex": 91
        },
        {
            "Ply": "B"
        }
    ]
}

I have been trying to figure out a way to make this happen but i have not been able to it, has anyone done this or has an idea on how to do it?