🚀 feature request

Relevant Rules

load("@rules_python//python:pip.bzl", "pip_install")

Description

We'd like to be able to override a requirement with a Bazel target. This is basically the rules_python equivalent of rules_jvm_external's override_targets directive.

Consider the case where we're using grpc and protobuf from Bazel, and an external python library depends on protobuf==3.13.0 (or whatever). I'd like to replace that dependency with "@com_google_protobuf//:protobuf_python" instead, so I'm not mixing pypi and Bazel versions of protobuf.

Describe the solution you'd like

I like the way that rules_jvm_external has done it.

Describe alternatives you've considered

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