Create LuaUI/Widgets by hand (case sensitive afaik so big W) and put your wiget there.
Then the important part ingame to enable local widgets:
F10 (Menu) -> check in right bottom corner "Show advanced settings"
then Settings -> Misc -> Local Widget Config -> Enable Local Wigets on own risk.
Maybe you need to do an /luaui reload or /reload in all chat.
go for F11 and try search if u haven't grouped your widget
* edit.
If u have more then one engine folder you need to add it to that engine folder you are using. So it is in Linux here
* oh 2 cnd edit.
np