How do I allow @pytest.mark.parametrize(argnames, argvalues) to dynamically modify argvalues according to fixture?

Question

I have two fixtures. One is called version carrying parameters. Another one is called data and it uses the version fixture.

Now I have a testcase called test_filter. It's decorated by @pytest.mark.parametrize("a, b", test_data["test_obj"]).

The problem is the test_data I want to read from a file according to its version.

But @pytest.mark.parametrize will collect test_data at the collection stage, the modification cannot be done. How do I modify test_data dynamically?

import pytest

@pytest.fixture(params=["v1", "v2"])
def version(request):
    return request.param

@pytest.fixture
def data(version):
    return Data(version)

class TestData:
    test_data = {
        "test_obj": ""
    }     ## read file according version

    @pytest.mark.parametrize("a, b", test_data["test_obj"])
    def test_filter(self, data, a, b):
        assert data.filter(a) == b