Use-APEX-Plugin-Code-Editor
See more: https://iminglei.blogspot.ca/2017/06/use-plugin-code-editor-part-14-demo.html
Note:
After import, please grant privilege to your application parsing schema.
-- adjust to proper apex schema
grant execute on apex_050100.wwv_flow_f4000_plugins to &owner;
grant execute on apex_050100.wwv_flow_f4000_util to &owner;