Is it possible to set SQL/JSON queries to return clob as default

Hi,

I'm using Oracle DB 19c (19.0.0.0.0) SQL/JSON queries in PL/SQL: json_arrayagg, json_object etc. with large quantity of nested data and need to set the "returning clob" option everywhere.

Is there any way to set the default json_* function to return clobs?

  select json_serialize(            
            json_arrayagg(
                json_object(
                  'id'     value name,
                  'doc'    value doc
                  returning clob
                )
            returning clob
            )
         returning clob pretty)
  select * from mytable