Adding fixtures to non-pytest test

[sashko1988]

Hello folks.
I need your help with adding fixtures to non-pytest tests.
By non-pytest tests, I mean tests that are either created with pytest_pycollect_makeitem or even non-python tests.
Example of the former (#13814) and latter(#12892):

class TooCustomToHandleCollector:

    def pytest_pycollect_makeitem(self, collector, name, obj):
        """Collects custom classes tests"""
        try:
            if self.lets_collect_class(obj):
                return TooCustomToHandle.from_parent(collector, name=name, obj=obj)

        except TypeError:
            pass

    def pytest_collect_file(self, parent, file_path):
        """Collects yaml files and tst files."""
        if file_path.suffix == ".yaml":
            # YAML files are collected by the YAML collector
            return yaml_file_collect(parent, file_path)
        return None


class TooCustomToHandle(pytest.Class):

    def collect(self) -> Iterable[pytest.Item | pytest.Collector]:
        func_name, custom_stuff = self.lets_collect_functions()
        if func_name and custom_stuff:
            yield TheCustomTest.from_parent(self, name=func_name, custom_attribute=custom_stuff)


class TheCustomTest(pytest.Function):
    def __init__(self, custom_attribute, **kwargs) -> None:
        super().__init__(**kwargs)
        self.custom_attribute = custom_attribute

    def runtest(self) -> None:
        self.obj(self.custom_attribute)

# yaml Item
class YamlItem(pytest.Item):
    def __init__(self, *, spec, **kwargs):
        super().__init__(**kwargs)
        # Stuff needed for fixture support.
        self.obj = None
        self._fixtureinfo = self.session._fixturemanager.getfixtureinfo(node=self, func=None, cls=None)
        self.fixturenames = self._fixtureinfo.names_closure
        self._initrequest()
        
        def setup(self) -> None:
        """Calls autouse fixtures from top conftest.py.
        """
        self._request._fillfixtures() 

I have a session-scoped fixture named my_special_fixture, that I want to use with all instances of these tests and some of the regular pytest tests.

How can I call the fixture for non-pytest tests?

Thanx