Gist to see how mkdocstring inherits types from superclass attribute

__init__.py

class Vehicle:
    """A vehicle class

    Attributes:
        weight: The weight of the vehicle
    """
    weight: float = 0.0

    def __init__(self, weight: float) -> None:
        self.weight = weight

class Car(Vehicle):
    """A car class

    Attributes:
        weight: The weight of the vehicle
        wheels: The number of wheels on the car
    """
    wheels: int = 4

    def __init__(self, weight: float, wheels: int) -> None:
        super().__init__(weight)
        self.wheels = wheels
        

index.md

Reference

::: type_inherit_mkdocs

mkdocs.yml

site_name: My Docs
plugins:
  - mkdocstrings:
      default_handler: python
      handlers:
        python:
          paths: [src]
          options:
            members_order: source
            show_source: false
watch: [src]

pyproject.toml

[build-system]
requires = ["setuptools>=61.0"]
build-backend = "setuptools.build_meta"

[project]
name = "type-inherit-mkdocs"
version = "0.1.0"
requires-python = ">=3.10"

dependencies = [
    "mkdocs",
    "mkdocstrings[python]>=0.18",
]