Setting environment in a python plugin

I created a plugin from a python recipe. For the recipe I use my environment based on Python 3.6 with some additional packages.

When I try to use the plugin, I get the error that one of the packages cannot be imported, which I assume happens because DSS uses some default python.

I tried to create an environment for the plugin. There is a "+CREATE A CODE ENVIRONMENT" button on the Summary page of the plugin. When I click it, it opens a dialog "New Code Environment" with a drop down menu with two options: R and Python. I pick Python.

A side point, I really expected to see a dropdown menu with all the available python environments and to pick mine, but it didn't happen. Why can't I just do that?

Anyway, I pick Python, click "Add". That takes me to the Edit tab and I see that the whole new section, code-env, was added. I see desc.json file with the following content:

{
  "acceptedPythonInterpreters": [],
  "forceConda": false,
  "installCorePackages": true,
  "installJupyterSupport": false
}

I'm wondering if there is a way to add key-value pair that would tell the plugin to use my environment, something like:

"use_code_environment": my_favorite_environment

I don't see anything in the documentation or tutorials.

There is a /code-env/python/spec/requirements.txt file. I"m thinking, maybe if I add the package I need here, DSS will add the package to the default environment. I do add the package, save, reload the plugin. Try to run it again and fail again, package is not found.

Then I notice on the Summary page the following

This plugin will not work until the code environment is properly setup.