Grab all fieldsnames in configs that don't have a paramfieldname right after it
/^(?<front>.+)"(?<key>FieldName)":."(?<value>\$?\w+)",(?!\n.+"ParamFieldName")$/gm
Add a paramfieldname below it as the lowercase of the fieldname with this replace regex
$&\n$1"Param$2": "\L$3",