you can list your package on the plugins list by adding this a JSON file in your package root folder with the name filament-plugin.json with content like this:
{"name": "FilamentAccounts","alias": "filament-accounts","description": {"ar": "full accounts manager with API\/Notifications\/Contacts to manage your contacts and accounts","en": "full accounts manager with API\/Notifications\/Contacts to manage your contacts and accounts","gr": "full accounts manager with API\/Notifications\/Contacts to manage your contacts and accounts","sp": "full accounts manager with API\/Notifications\/Contacts to manage your contacts and accounts" },"keywords": [],"priority": 0,"providers": ["TomatoPHP\\FilamentAccounts\\FilamentAccountsServiceProvider" ],"files": [],"title": {"ar": "Filament Accounts","en": "Filament Accounts","gr": "Filament Accounts","sp": "Filament Accounts" },"color": "#007dff","icon": "heroicon-c-user-circle","placeholder": "placeholder.webp","type": "lib","version": "v1.0","github" : "https://github.com/tomatophp/filament-accounts","docs" : "https://github.com/tomatophp/filament-accounts"}
make sure you allow packages to scan on the filament-plugins.php config file