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;