[Python] How to let pylsp find imports in local project?

When starting my editor with pylsp inside a projects folder I can see the LSP root dir is chosen to be the top folder, where .git is. However the python code is located in a subfolder so the corresponding python imports are not understood by the lsp. (goto_definition results in "No location found").

How can I make pylsp understand where my python code is?

More details:

The project structure is:

.
├── .git
├── src
│ ├── python
│ │ ├── foo.py
│ │ ├── app
│ │ │ └── core.py
│ └── lang2
│ ├── bar.lang2
│ └── settings.py
├── system
├── tests
│ └── run.py
└── util
├── examples
│ └── example.py
└── run.py


after starting my editor I would like these imports to connect correctly into the src/python folder.

import foo
from app import core
from app.core import Thing


I use Neovim with python-lsp-server as my LSP. What are my options to fix this issue?

I tried to launch it like this, but it had no obviuos affect:

PYTHONPATH=src/python/ nvim


The more general the solution, the better.

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