Create instance of a imported python class with C API

I want to create an instance of a Python class with the C API.

My specific use case is the PySerial Object. My Python code would be:

import serial
test = serial.Serial()

I couldn’t find any clue or Tutorial for doing so.
The only thing I think to know is to declare it as a dependency in my pyproject.toml and import it somehow with a PyImport_* function.

My current code looks somehow like this:

...
/*! Python Module Initialization Function
 * This function will be called when importing the Module to the Python Interpreter.
 * In this function all Python Objects and Constants are added to the Python Module.
 */
PyMODINIT_FUNC PyInit_Module(void)
{
    PyObject *m;
    // Check SubClass Type
    if (PyType_Ready(&SubClassType) < 0) return NULL;

    m = PyModule_Create(&Module_module);
    if (m == NULL) return NULL;

    /* Adding SubClass Class */
    Py_INCREF(&SubClassType);

    if (PyModule_AddObject(m, "SubClass", (PyObject *)&SubClassType) < 0) {
        Py_DECREF(&SubClassType);
        Py_DECREF(m);
        return NULL;
    }

    PySerialObject = PyImport_ImportModule("serial");
    if (PySerialObject == NULL) {
        Py_DECREF(&SubClassType);
        Py_DECREF(m);
        return NULL;
    }

    return m;
}
...
/*! SubClass new
 * Creating new SubClass Python Object
 */
static PyObject *SubClass_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
    SubClassObject *self;
    self = (SubClassObject *)type->tp_alloc(type, 0);
    self->serial = NULL;
    if (self != NULL) {
                //self->serial = PyObject_CallNoArgs((PyObject*)Py_TYPE(PySerialObject));
        self->serial = PyObject_CallOneArg((PyObject *)Py_TYPE(PySerialObject), Py_BuildValue("serial.Serial()"));
        if (self->serial == NULL) return NULL;
    }
    return (PyObject *)self;
}

My goal is to use the serial.Serial() Python object inside my C code.

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