Adding --find-links URLs to dependencies in pyproject.toml

Question

You can install the python package Jax with some extra packages depending on your environment.

For GPU:

pip install jax[cuda] --find-links https://storage.googleapis.com/jax-releases/jax_cuda_releases.html

For TPU:

pip install jax[tpu]  --find-links https://storage.googleapis.com/jax-releases/libtpu_releases.html

How do I add those --find-links URLs to the following pyproject.toml?

[build-system]
requires = ["setuptools>=67.6.0"]
build-backend = "setuptools.build_meta"

[project]
name = "minimal_example"
version = '0.0.1'
requires-python = ">=3.9"

dependencies = [
    "seqio-nightly[gcp,cache-tasks]",
    "t5[gcp]",
    "t5x @ git+https://github.com/google-research/t5x.git"
]

[project.optional-dependencies]
cpu = ["jax[cpu]"]
gpu = ["jax[cuda]" , "t5x[gpu] @ git+https://github.com/google-research/t5x.git"]
tpu = ["jax[tpu]", "t5x[tpu] @ git+https://github.com/google-research/t5x.git"]
dev = ["pytest", "mkdocs"]

If I do pip install -e . then I get a working install. But doing a pip install -e ".[gpu] gives me a ResolutionImpossible error. And doing pip install -e ".[tpu] gives me:

Packages installed from PyPI cannot depend on packages which are not also hosted on PyPI.
jax depends on libtpu-nightly@ https://storage.googleapis.com/cloud-tpu-tpuvm-artifacts/wheels/libtpu-nightly/libtpu_nightly-0.1.dev20210615-py3-none-any.whl