Transforming a Single Property into Two Derived Properties

How would I best go about transforming one property into two "derived" properties?

So e.g. turning

{
magicString: "1234"
}

{
magicString: "1234"
}

{
magicString: "1234"
}

{
magicString: "1234"
}

into

{
string: "1234",
description: "some description for this number based on a transform"
}

{
string: "1234",
description: "some description for this number based on a transform"
}

{
string: "1234",
description: "some description for this number based on a transform"
}

{
string: "1234",
description: "some description for this number based on a transform"
}

Transforming

{
magicString: "1234"
}

{
magicString: "1234"
}

{
magicString: "1234"
}

{
magicString: "1234"
}

into

{
description: "some description for this number based on a transform"
}

{
description: "some description for this number based on a transform"
}

{
description: "some description for this number based on a transform"
}

{
description: "some description for this number based on a transform"
}

Is not the issue, but I currently fail in transforming into two distinc things (or renaming and transforming based on the same property)

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