There is currently no way to add new tools to DragonLens, which would be very useful for modders who wish to implement new features to extend the functionality of DragonLens.
CheatSheet and HerosMod has support for this in various ways:
https://github.com/JavidPack/CheatSheet/wiki/API
https://github.com/JavidPack/HEROsMod/wiki/Support-using-Mod-Call
If this sounds interesting, I could make a PR for this. @ScalarVector1