Copy_to using a path?

Is it possible to use a path for the copy_to value? something like:

{
"book": {
"title": {
"type": "string",
"properties": {
"en": {
"type": "string",
"copy_to": "title.newTitle"
},
"newTitle": {
"type": "string"
}
}
}
}
}

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