Setuptools-based pip install with no-build-isolation-package

Question

I am trying to create a simple pyproject.toml file where I can disable disable build isolation for a specific dependency. The idea is that a the install process should install setuptools if this is missing, and check that another dependency (which requires manual installation) is already present. uv tools seem to offer something like this (see here), but I'd like to stick to "basic" pip.

Note: I saw that pip provides a --no-build-isolation flag, but this would also affect the setuptools requirement, wouldn't it?