I cannot upload my plugin zip file

I have checked this helper url https://docs.shopware.com/en/shopware-platform-dev-en/references-internals/plugins/plugin-base-class?category=shopware-platform-dev-en/references-internals/plugins

After that, I have created zip file for my plugin, and tried to upload it , but failed.

Error message is as follows The required composer.json file was not found Context: [ • reason: The essential composer.json file for the plugin was not in the expected folder]

Could you tell me what the reason is?

Is your Plugin Name in store also FinoGMI?