How Do I Build a Dynamic README? - Packaging in Python

First, add hatch-fancy-pypi-readme to your [build-system] table:

pyproject.toml

[build-system]
requires = ["hatchling", "hatch-fancy-pypi-readme"]
build-backend = "hatchling.build"

Then tell hatchling about the dynamic readme and remove the readme field:

pyproject.toml

[project]
dynamic = ["version", "readme"]