Linking against python for tests that depend on a pyo3_extension

We have a [pyo3_extension](https://bazelbuild.github.io/rules_rust/rust_pyo3.html#pyo3_extension) target which builds a python extension module. As I understand it, this builds as if the `extension-module` feature is enabled so that the library does not link against python. But in some tests we would like to link against libpython so that tests can use pyo3 features such as `PyResult`. Is there any documentation about how to do this with rules_rust? In cargo we can disable the `extension-module` feature when running tests and everything works as expected. Is there a dependency I can get from a rules_python toolchain for example to link libpython into a particular rust_test target?