Use PostgreSQL extension and other external libraries in Wappler

I want to use this extension library for PostgreSQL in a NodeJS Wappler project.

How can I do this in a way that the functions are available in the Server Connect database query modules?

And more in general: How would external scripts/libraries best be added to have the functions available from the SC action steps? I guess by copying them to a folder within the Wappler project folder and using the API action module to connect to it?