Use Request Transformer Plugin for renaming nested json?

Hi,
I am looking to transform a SCIM structure into another REST structure.

In order to do that, my request body needs to un-nest and rename some attributes.

For example:
{
“name”: {
“givenName”:“Foo”,
“familyName”:“Bar”
}
}

should be converted to:
{
“firstName”:“Foo”
“lastName”:“Bar”
}

I can rename top level items with config.rename.body
like: config.rename.body=userName:id
but I’d like to figure out how to refer to the nested attributes.
Thank you,

Did you find a way to do this mate?