@JSONSETVALUE[xpath,]value,type] : Sets a new value for the element specified by XPath. The file must have been opened with a previous @JSONOPEN.
If xpath is not specified, @JSONSETVALUE will default to the current xpath.
value specifies the new value.
type specifies the type of the value. Possible values are:
•0 (Object)
•1 (Array)
•2 (String)
•3 (Number)
•4 (Bool)
•5 (Null)
•6 (Raw)
