simple built-in list instance, that can work with a dimensions array.

List.py

from typing import overload, Any


class List(list):
    @overload
    def __getitem__(self, t: tuple, /) -> list[Any]: ...
    def __getitem__(self, v, /):
        if isinstance(v, tuple):
            _v = None
            for i in v:
                if _v is not None:
                    if not isinstance(_v, (list, tuple, list, set)):
                        raise IndexError("list index out of range")
                    _v = _v[i]
                else:
                    _v = self[i]
            return _v
        return super().__getitem__(v)

data = List([
    [0, 1, 2, 3, 4, 5],
    [1, 2, 3, 4, 5],
    [2, 3, 4, 5],
])

data[0:2,0,0:3]