Escape sequence in a dynamic SQL

Hi,

     I need to retrieve few columns by doing string concatenate with several single codes to get to a Json format

As like oracle can we give an escape sequence like q'#? if so please let me know the format.

Also the table from which the JSON has to be created is passed dynamically.The table name would be stored in a variable

Example is as below:-

declare

v_tablename varchar(2000):='employee'

v_sql varchar(2000);

v_result clob;

begin

v_sql := q'# select

           '{"ENTITYATTRVALUE":{'

       ||

        '"ATTRS":[' || string_agg('{ "ID":"' || e.id  || '", "NAME":"' || e.name ||  '", "VALUE":"' || e.value

          ||',"DATA_TYPE":"' ||e.DATA_TYPE ||'" '

          || ',"DEFAULT_VALUE":"' || e.DEFAULT_VALUE || '" '||

into v_result from v_tablename e

#';

exec v_sql;

end;

I would like get the output of the select query as a JSON in v_result by querying the table where the table name is substituted from v_tablename

Requesting for help.

Thanks,

Athrey