How to use path variable in JSON path-CodePudding

I'm trying to use a path variable in a JSON path.

My problem is that my variable is added as a new key to the JSON object instead of replacing my path.

My Example Code

Data = {
    first:{
        "Name":"John",
        "Age":"43"
    }
}

let path = "first.name"
let value = "Jan"

Data[path] = value
console.log(Data)

Current Output

Data = {
    first:{
        "Name":"John",
        "Age":"43"
    },
    "first.name": "Jan",
}

Expected Output

Data = {
    first:{
        "Name":"Jan",
        "Age":"43"
    }  
}

Is there a way to solve this? Thanks for your help