Subdirectory file structure not supported

[s0mnaths]

I am using pluginlib to add the plugin architecture to my application. However, I want to maintain a good folder structure, something like

├── project
│   ├── plugins
│   │   ├── plugin_parents.py
│   │   ├── plugin1.py
│   │   ├── plugin2.py
│   ├── main.py
│   ├── plugins_list.txt
│   ├── requests.py

However, it gives me the error saying plugin1 not found when I run the program. I tried passing absolute paths too. I'm able to use pluginlib only when all the files are in the same directories.

Can you help me with this?
Thank you.