SQLAnywhere currently provides the ability to create a web service of TYPE 'JSON' that can return a JSON-serialized result set.

Sample output of a web service returning "select * from people":

[
    {"person_id":"1", "first_name":"John", "last_name":"Doe"},
    {"person_id":"2", "first_name":"Jane", "last_name":"Smith"}
]

Is there any way to utilize the underlying JSON serialization function so that the JSON output string can be manipulated before it is returned from the web service? This would be very useful for creating JSON that is more than just the array notation representation of a result set, so that it can be easily consumed by popular JavaScript library components from ExtJS or jQuery.

Example showing how a "JSON" function that operates in a similar manner to XMLELEMENT() might be used:

declare json_text long varchar;

set json_text = 
     '{' || 
          '"success": true' ||
          JSON('rows', select person_id, first_name, last_name from people); 
     '}';

could produce something like (formatted for readability):

{
    "success": true,
    "rows": [
        {"person_id":"1", "first_name":"John", "last_name":"Doe"},
        {"person_id":"2", "first_name":"Jane", "last_name":"Smith"}
    ]
}

I'd be happy with just getting the result set array notation string and constructing the JSON manually though if the serialization function were exposed.