OpenModelica on Python and external library using mod=ModelicaSystem

I can run the simulation using below code (Building is external library and RoomM is the model), but I want to use mod=ModelicaSystem....to be able to edit parameters.

from OMPython import OMCSessionZMQ
from OMPython import ModelicaSystem
omc = OMCSessionZMQ()
omc.sendExpression("loadModel(Modelica)")
omc.sendExpression("loadFile(\"C:\OpenModelica1.18.1- 
64bit\lib\omlibrary\Buildings-9.1.0\Buildings- 
9.1.0\Buildings\package.mo\")")
omc.sendExpression("loadFile(getInstallationDirectoryPath() + 
\"/share/doc/omc/testmodels/RoomM.mo\")")
omc.sendExpression("instantiateModel(RoomM)")
omc.sendExpression("simulate(RoomM, stopTime=1.0)")

...below is the code that fails:

mod=ModelicaSystem("C:/OpenModelica1.18.1- 
64bit/share/doc/omc/testmodels/RoomM.mo","RoomM", 
["C:\OpenModelica1.18.1-64bit\lib\omlibrary\Buildings-9.1.0\Buildings- 
9.1.0\Buildings\package.mo"])

Notification: Skipped loading package Buildings (9.1.0,default) using
MODELICAPATH C:/OpenModelica1.18.1-64bit/lib/omlibrary (uses-
annotation may be wrong).

For the following Modelica Model

NeedBuildings.mo

model NeedBuildings
  extends Buildings.Examples.Tutorial.SpaceCooling.System1
  annotation(uses(Buildings, version="9.1"));
end NeedBuildings;

you can initialize a ModelicaSystem with:

from OMPython import ModelicaSystem
mod=ModelicaSystem("NeedBuildings.mo","NeedBuildings", ["Buildings"])

The important part is, that the needed libraries are in a default location and can be found by OpenModelica.

If your model RoomM has a correct uses annotation you don't even need to specify what libraries should be loaded, it will be loaded automatically.

So it's enough to call:

mod=ModelicaSystem("NeedBuildings.mo","NeedBuildings")

From the OpenModelica User's Guide:

> - The first input argument must be a string with the file name of the Modelica code, with Modelica file extension ".mo". If the Modelica file is not in the current directory of Python, then the file path must also be included.
> - The second input argument must be a string with the name of the Modelica model including the namespace if the model is wrapped within a Modelica package.
> - The third input argument (optional) is used to specify the list of dependent libraries or dependent Modelica files.
> - The fourth input argument (optional), is a keyword argument which is used to set the command line options.