According to poetry self add --help it should work with directories, but it does not.

I want to split my package into many packages (let us say I am going to use monorepo approach) and wanted to develop a couple of plugins for poetry. I wanted to store those plugins inside the repository and develop them together with my other packages.
Unfortunately when I am doing poetry self add ../mypoetryplugin I see an error. It looks like poetry cannot resolve package. Unfortunately -vvv is not informative, it just prints stacktrace, but no additional information about resolution, anything I could follow and analyze to understand the issue.

• Operating system: Ubuntu 20.10
• Poetry debug output:

Poetry
Version: 1.2.1
Python:  3.10.6

Virtualenv
Python:         3.10.6
Implementation: CPython
Path:           NA
Executable:     NA

System
Platform:   linux
OS:         posix
Python:     3.10.6
Path:       /home/wieczyk/.pyenv/versions/3.10.6
Executable: /home/wieczyk/.pyenv/versions/3.10.6/bin/python3.10

Reproduction is quite simple, we can use any public poetry plugin to reproduce issue.

$ git clone https://github.com/tiangolo/poetry-version-plugin.git
$ poetry new myproject
$ cd myproject
$ poetry self add ../poetry-version-plugin

Could not find a matching version of package ../poetry-version-plugin/