Can´t generate assets by using angular

I installed the dependency like written in the ReadMe.md. "@capacitor/assets": "^3.0.4"

Im using Angular with Ionic/Capacitor and my folder structure looks like following:

- MyApp
-- src
--- assets
-- android
-- ios
-- www

Now i wanted to generate my assets but by using npx @capacitor/assets generate --android
> Asset directory not found at ... Use --asset-path to specify a specific directory containing assets

Now with npx @capacitor/assets generate --android --asset-path MyPath
> error: unknown option '--asset-path'

If i go into my folder /src and try it again npx @capacitor/assets generate --android
> No platforms found, exiting

Now using without android it works but only generate assets for pwa.