I guess/hope that most of it is described in the Beta doc page, but things could have changed a bit since then:
https://www.autoitscript.com/autoit3/scite/download/beta_SciTE4AutoIt3/SciTE5-with-DynamicFunctions/doc/SciTE4AutoIt3-autocomplete_dynamic_includes.html
Guess I should add that any already included file is also scanned for Funcs and shown in the dropdown.
Does that cover your question?
This UDF can be used to Display bar charts in a window. I hope you can need it. Exampleimage: If you like it, please leave me a comment, also if you have any suggestions to make it better or if you found bugs.
Chart_UDF_source.zip