Completion with annotations for org-mode.
Download repository and it to your load path in your init file:
(add-to-list 'load-path "/path/to/org-extra-complete/")
(require 'org-extra-complete)
(use-package org-extra-complete
:straight (:repo "KarimAziev/org-extra-complete" :type git :host github)
:commands (org-extra-complete org-extra-complete-src-headers-args))
org-extra-complete
Main command. Complete org keywords and values.
org-extra-complete-src-headers-args
Complete a header argument selecting from lists of common args and values.