How to insert a carriage return and line field between fields in a query

I have a query like the following:

SELECT fld1 || fld2

I need to insert a carriage return (\r) and a line feed (\n) after each
field. How can I do this?

I tried
SELECT fld1 || \r\n || fld2 || \r\n
and also
SELECT fld1 || '\r\n' || fld2 || '\r\n'

without success.

I will very much appreciate your feedback.