APEX

I would like to display success messages this way:
Message1
Message2
Message3
...

But it currently is displayed this way:
Message1Message2Message3...

I tried combining my processes into one process like this

declare
   v_vc_message   varchar2(200);
begin
   -- process 1
   /* my process*/
   v_vc_message := 'Succes message1';
   
   -- process 2
   /* my process*/
   
   if v_vc_message is null then
      v_vc_message := 'Succes message2';
   else
      v_vc_message := v_vc_message || *[char_for_line_break]* || 'Succes message2';
   end if;
   
   :P17_MESSAGE_PR := v_vc_message;
exception when others then 
   :P17_MESSAGE_PR := 'Error message';
end;

and then I put &P17_MESSAGE_PR. in my success and error message

I tried different things to get a line break.
I tried

'<br>'
'&# 60;br&# 62;'  (without the spaces)
chr(10) || chr(13)

Anyone can help me ?

Thanks