Pytest marks: mark entire directory / package

I am testing several versions of a component using Pytest. Some tests can run on all versions, some are version specific. For example

tests
|
|-- version1_tests
|   |-- test_feature_1_1.py
|   |-- test_feature_1_2.py
|   |-- test_feature_1_n.py
| 
|-- version2_tests
|   |-- test_feature_2_1.py
|   |-- test_feature_2_2.py
|   |-- test_feature_2_n.py
|
|-- common_tests
|   |-- test_feature_common_1.py
|   |-- test_feature_common_2.py
|   |-- test_feature_common_n.py

I would like to mark my tests such that I can select if I want to test Version 1 (version1_tests + common_tests) or Version 2 (version2_tests + common_tests) from the command line.

The way I am currently doing this is for each test module, I add a pytest marker and then specify the marker from the command line. For example, in test_feature_1_1.py:

import pytest
pytestmark = pytest.mark.version1

class TestSpecificFeature(object):
    ...

And then to run: python -m pytest -m "common and version1"

This works fine, but I have to manually add the marker to every module, which is tedious because there are actually dozens (not 3 like in the example).

We used to use Robot Framework, where it was trivial to "mark" an entire folder by adding tags into the __init__.robot files. Is there any equivalent way to do this in Pytest, or is marking each module the best I can do?