If you want to add the skimage transformation between other Image transformation, you could use the following code snippet as a base class and apply the desired transformation inside:
class MySkimageTransform(object):
    def __init__(self):
        '''
        initialize your transformation here, if necessary
        '''
        

    def __call__(self, pic):
        arr = np.array(pic) # transform to np array
        # apply your transformation
        pic = Image.from_array(arr)
        return pic