output

C:\devel\homework\venv\Scripts\python.exe C:/devel/try-something/py/my_sample.py
[{'kind': 'above', 'args': ['div']}, {'kind': 'above', 'args': ['img']}]
[{'kind': 'above', 'args': ['div']}, {'kind': 'above', 'args': ['img']}]

sample.py

class RelativeBy(object):
    def __init__(self, root=None, filters=[]):
        self.root = root
        self.filters = filters

    def above(self, element_or_locator=None):
        self.filters.append({"kind": "above", "args": [element_or_locator]})
        return self

    def to_dict(self):
        return {
            'relative': {
                'root': self.root,
                'filters': self.filters,
            }
        }


def with_tag_name(tag_name):
    return RelativeBy({"css selector": tag_name})


p = with_tag_name("p").above("div")
a = with_tag_name("a").above("img")

print(p.filters)
print(a.filters)