Are there any tutorials or docs other than https://docs.lucee.org/guides/lucee-5/extensions.html to build your own Lucee Extensions? Specifically, I'm having some issues trying to create a server virtual mapping on install to point to a set of code that lives within the {server-context}/ I'm having a hard time figuring out what mappings directive would look like.

https://docs.lucee.org/guides/lucee-5/extensions.html#mapping ? https://docs.lucee.org/guides/lucee-5/extensions.html#install-context-files ? the doc and admin extensions only create mappings for an archive (which was bundled in core) https://github.com/lucee/extension-doc/blob/master/build.properties