Hi Stephan,
As this post WDTC widget | The OpcUa viewer widget - #7 by hobi from Christian Hobelsberger tell, there is some module that are not exposed anymore.
I don’t really know if “libs” folder isn’t exposed but I could take a look tonight.
The easiest solution is to copy paste the module in the new widget but you need to take care of the import of the module you have import.
I keep you in touch after taking an eyes.