widgets missing in pypi package

Traceback (most recent call last):
  File "/users/denolf/virtualenvs/pybox_xpwvVV/ubuntu_20_04/py310/lib/python3.10/site-packages/orangecanvas/registry/discovery.py", line 294, in iter_widget_descriptions
    module = asmodule(name)
  File "/users/denolf/virtualenvs/pybox_xpwvVV/ubuntu_20_04/py310/lib/python3.10/site-packages/orangecanvas/registry/discovery.py", line 537, in asmodule
    return __import__(module, fromlist=[""])
  File "/users/denolf/virtualenvs/pybox_xpwvVV/ubuntu_20_04/py310/lib/python3.10/site-packages/orangecontrib/ewoksndreg/reg2d_intensities.py", line 11, in <module>
    from ewoksndreg.tasks import Reg2DIntensities
  File "/users/denolf/virtualenvs/pybox_xpwvVV/ubuntu_20_04/py310/lib/python3.10/site-packages/ewoksndreg/tasks/__init__.py", line 3, in <module>
    from .example2d_stack import *  # noqa F401
  File "/users/denolf/virtualenvs/pybox_xpwvVV/ubuntu_20_04/py310/lib/python3.10/site-packages/ewoksndreg/tasks/example2d_stack.py", line 3, in <module>
    from ..tests.data import data_for_registration
  File "/users/denolf/virtualenvs/pybox_xpwvVV/ubuntu_20_04/py310/lib/python3.10/site-packages/ewoksndreg/tests/data/data_for_registration.py", line 5, in <module>
    from skimage import data
ModuleNotFoundError: No module named 'skimage'