The context menu pick Embed/Expose, which was Advanced Format tied to Ctrl-Shift-F7. Should have an option to convert to/from PL/Sql strings. Currently it only dose Java and Python. Where is uses double quotes to delimit strings and pluses (" +) to concatenate. Adding PL/Sql would use single quotes and pipes ( ' | ) . Also the equal would change to colon and datatype could be omitted set to varchar2(###).
Currently conveted code is like this
<code>String sql = "SELECT sysdate \n"+
"from dual ";</code>
If there was a PL/Sql option it would look like
<code>sql varchar2(4000) := 'SELECT sysdate \n' ||
'from dual ';</code>