Custom library category

[JonathanMeer]

Dear Community
In the library of libraries (if you go to "+ More Shapes...") there are some categories, like Standard and Software in this screenshot:

Is it possible to create a custom category there and add the custom libraries to it?
I will be adding over 10 libraries and it would be important for my users to have them in one place.

Is it possible to add the category and libraries by writing them to the appropriate file in the application data?
If so, what would be the appropriate files?

Thanks in advance
Johnny