Unsigned integer - type of variable - LibreOffice Basic

Is there any possibility to use unsigned integer type variables (ULong) in LibreOffice Basic?

In the document “LibreOffice BASIC Runtime Library”

one can find a bit of info about possible types of variables (section “Variables information functions”)
but in this document it is stated that ULong is internal type and cannot be used.

Is there a way to make use of internal types in user’s modules?