How to convert LONG to VARCHAR2 in PL/SQL

I want to convert LONG to VARCHAR2 in PL/SQL on the fly.

Note that we are using AL32UTF8 characterset.

Below works only when view text is smaller than 8K.

declare

 v_res varchar2(32767);

begin

 select text

 into v_res

 from dba_views

 where view_name='VIEW_SMALL';

end;

When the view text is larger than 8K I get error:

06502. 00000 - "PL/SQL: numeric or value error%s"

I know you can convert to VARCHAR2 with a temporary table with below command.

create table temp_user_views as select view_name, text_length, to_lob(text) text from dba_views;